So right now I use mostly craft paint for my minis and I'm wonder if its worth buying any of the various paints aimed at the mini painting. What are your thoughts on whatever brand?

Whichever miniatures paint you can find for the cheapest price, there is little difference in any of them really. Look for:

Miniature Paints: Cheap but rubbish lids

Coat d' Arms: My favourite for price and bottle type

Games Workshop: Expensive but good, but don't like the lids

Vellejo: Expensive and come in dropper bottle, don't like these bottles either

and there are others than are dropper bottles such as Army Painter

Hmmm, weirdly it seems to be the bottle/lid & price that effects my purchases rather than paint

I think actual miniatures paints are a worthwhile investment, as they give a lot better service than cheap craft paints, allowing for better colors, coverage, and consistency without as much work from the painter. When I first started painting, I used oil based paints, as water based paints were not very good. Over time, the water based paints available have far surpassed the quality and range of the oil based paints for my purposes, and are easier to use and maintain. As for brands I've worked with:

I started with GW's Citadel paints when I first changed to water based painting, because they were one of the few available. GW's paints don't work as well where I am, because they have drying agents that aren't needed in the desert. I've never been hugely impressed with their bottles, either, as they add and compound issues. As other companies put out colors that came close to those I liked from GW, I let my GW collection dwindle until I only have some very old paints no longer available from GW (without the frying agents) that I still use on occasion.

Reaper Master Series has very nice paints. They use dropper bottles, but I've gotten used to them, and find it does help keep my paints in better shape. They add skulls as agitators to their paint pots, which helps a lot with keeping the paints in great shape, and have a phenominal palette of colors to work with. Their triad system has pre-formulated highlight and shading colors. They also have an excellent selection of metallics and skin tones, as well as one of the widest selections of overall paint colors. The HD paints give better single coat coverage on a smaller range of base colors, but the regular Master Series flow and blend slightly better for full blending work or simple dry brushing. They are my primary go to paints.

Vallejo are very similar to Reaper, but don't have the agitators, nor as wide a range of colors. They are on a par with Reaper's quality, but their range of colors makes you do more work if you want to highlight or shade. I have some to supplement my Reaper sets because I did a few painting jobs where people asked for very specific colors, and I saw no reason to mix Reaper to match when Vallejo were good paints. They have a range of purpose designed WW2 colors, but the names don't match where their color guides suggest you use them.

Coat d'Arms I haven't tried in quite a while. I was unimpressed originally, but haven't seen reason to try them again, even though I've heard reports they have improved greatly.

What little I've dealt with P3 has been a mixed reaction. They were OK, but not worth changing from the texture and consistency I'd gotten used to with Reaper.

You can get good results with just about any paint, but you'll have to work harder with some paints.

If you want to go for some accuracy in colors, I do recommend the Flames of War color sets like:

These work well as they have colors designed for WWII historical miniatures and are made by Vallejo, whom I prefer for my miniature painting.

Ultimately you will want to try a few different brands. I have been using craft paints for years and there are some colors I really love. I highly endorse GW's Foundation paints simply because the coverage is amazing. I will also say that the Flames of War paint sets are really good if you are going for a historical look. The have very good coverage and they are easy to work with.

I'm not sure how long you have been painting- but if you are new I have one word of advice. Just keep practicing! You will find that technique can go a long way in making your minis look great, no matter what paint you use. Just experiment.

Vallejo has colors specified as for WW2, but don't assume they are the most accurate colors available simply because they say they are WW2 colors, or use WW2 names. Buying them because of that could be a mistake, though they are quality paints for those that like them.

Color control for uniforms in WW2 was extremely poor. Multiple manufacturers using multiple dye lots with various techniques could lead to uniforms from the same bolt of cloth having very different colors.

Add variations in uniform specifications that changed through the war, and you get more variety available. The Germans used greys to grey -greens of various levels beyond the huge variation of camoflague patterns they used, as an example.

The US used OD green and browns from so many manufacturers it resulted in some very mixed looking units, which carried over to any allied army using gear from the US (ie: all of them).

The same held true for Britain, Russia, and everybody else. Add problems due to dye shipments being blown up, confused or damaged, and it gets more interesting. Mix in weathering from veteran troops in used uniforms fighting with fresh recruits in fresh uniforms, and you get more variation.

It was well after WW2 that uniforms got more consistent starting colors, but even then had variations due to weathering and how they were washed.

Vallejo has some good color options, though as I noted, some of them get used in ways you might not expect. I recall seeing a color chart for Soviet troops saying to use a color noted as a German uniform shade.

I'd recommend finding paints you like to work with, and then find some color images to give you an idea for colors. So long as you come anywhere near those shades, you should have nice, historical results.