First of all this is primarily not a complaining about Raddus being to OP post. (though there will be a little of that too ;P)
I dislike Raddus' effect for a lore reason. In Star Wars hyperspace jumps are fairly inaccurate. You can jump into a system but the exact location that you will end up is a bit fuzzy. That's why you can't just jump into an ISD's rear where it is vulnerable or behind a Golan defense platform. It was Grand Admiral Thrawn that figured out that using the Interdictors gravwell generators you can pull a ship out of hyperspace in a precise location. This was basically a groundbreaking new invention that required state of the art interdiction technology. This became Thrawns signature strategy in the old EU known as the Thrawn Pincer . All that being said Raddus can just summon a ship to an exact location on the board. No Interdictor required. This shouldn't be possible. I think a more appropriate effect would have been: Deploy a ship in any deployment zone. Or deploy a ship within range five from any edge of the play area. This would be much more consistent with the lore but would still give a lot of flexibility. And instead the precise warp-in of a ship should be something that requires Interdictors and Thrawn in the game.
(now to the ******* about Raddus part ;P)
All that being said. The ability for an enemy ship to just appear in the rear of my ships seems a little "game breaking". It circumvents the entire strategic aspect of positioning which is the most important thing of the game! And this goes doubly against Imperial ships. While Rebel ships only need to turn a little to get the Raddus bomb into their main firing arc (the side). For Imperial ships it is just strait up impossible to ever get the Raddus bomb into their main arc. This feels unnecessarily harsh towards imperial players. Also from what I read on multiple sites Raddus is basically considered to be one of, if not the best commander in the game. Meaning he is often times a better pick than others when playing competitively. That sounds a lot like power creep to me. So maybe a change that makes him equally as good as other commander would be favorable.
And worst of all. I thing Raddus just makes for unfun games. When I play Star Destroyer and there is just fundamentally no chance for me to get the enemy in my front arcs (no mater how good I fly) that just feels unsatisfying. It often feels like you need your enemy to make a mistake instead of just playing good yourself.
Now I want to conclude by saying that this is not an outcry to change Raddus. I have played against him and you can win against him. I am not saying he needs changing and I don't expect FFG to errata a commander. And ****, I am not a professional player. My opinions on balance my not be very valid. But these are my thoughts. Let me know what you think! Especially concerning the lore part.