Wiz-kids is pretty much the pinnacle of bad rarity distribution.
How is that?
Overall they gave a habit of including even more rare rarities to thier games, along with generally following a model in which more rare = more better.
Now obviously there is always the urge to justify the rarity by making the item worth it, but there is a tipping point on which it becomes problematic. Tsarina and Gobby being prime examples of this. They were both of the highest rarity and absurdly powerful compared to everything else.
For instance in Heroclix they have the following rarities. Common, Uncommon, Rare, Super Rare, Chase. But then there are also Primes of each rarity except Chase. And then you also might have special items that could be in any pack. They might even have Super Chases at this point, it wouldn't suprise me.
On the other hand, wich are some of the most played cards? Hulk (starter set or uncommon) Professor X (common) The two banned cards? basic actions from the starter sets. DM is actually a game that has very good commons and uncommons. I got me 3 decks without rares and only thing that comes close to stopping them is hulk,
Wizkids isn't alone in that: one word: yu-gi-oh (is that one word?)