Sorry, the Prometheus was actually classed as a warship/battleship (I think the latter) rather than a cruiser
Actually, it was listed (in the various sources I've found) as: Cruiser, Heavy Cruiser, Battleship, Warship, Starship (bit generic, that one), and Tactical Cruiser. The fact of the matter is that virtually every major Star Trek starship except the Defiant class has been referred to as a cruiser at some point, because it's never really clear what that term means - as long as it is a moderately powerful starship capable of independent operations, it seems like it was fair game for the cruiser label at some point, which is really my point. If we are now defining ships not based on in-game terms, that is rapidly a slippery slope.
Also, Akira still counts in any case
Also also, see my earlier posts on why trying to base game design decisions on 'canon' background is a terrible idea
In all honesty, it doesn't matter how much logic and actual facts we post here. No offense intended to OP, but he is blinded by his own opinions and how he thinks the game should be. The unfortunate part is that as soon as anyone says something different, he just gets defensive and jumps all over them, trying to make them look bad and make himself look good and right.
If you actually were a little more open minded OP, we wouldn't all seem to be trying to insult you. Take a step back, and look at what we actually have to say. And leave room for yourself being wrong. It's not as bad as you think.