I'm going by STO's own forums, where there exists no small amount of wailing and gnashing of teeth about STO's Galaxy being a toothless tiger.
The first post of
that thread states that "the Galaxy Class in the game is COMPLETELY
disappointing compared to its on screen counter part." (emphasis mine)
--------------
Every video game differs in trying to convert on-screen material to ship functions and numbers needed for simulated battles. There are numerous examples of these discrepancies:
-In "Star Trek: Armada", for example, the
Defiant is extremely (extremely,
extremely,
extremely) under-gunned compared to its on-screen version. (My guess is that Activision was pissed at how long it took for them to get the rights to use material from DS9.)
-In "Star Trek: Armada II", the
Sovereign has an actual working corbomite reflector. (It wasn't a bluff after all...

) Riker and Picard probably forgot to turn it on against the Son'a battleships and the Scimitar respectively...
-In "Star Trek: Bridge Commander", the
Vor'cha is nearly invincible when attacking its forward shields... making it much better than a Romulan warbird (so much so that an in-game cut scene requires a script to disable a
Vor'cha's weapons when fighting a warbird rather than letting it play out normally as in most other cut scenes).
-In "Star Trek: Dominion War", the
Galaxy is much stronger than a Dominion battlecruiser when they should be equal (at best).
-In Bridge Commander (made by Activision), an
Akira is more dangerous than a
Galaxy. In every other game made by Activision, a
Galaxy is better than an
Akira.
-There are many more examples...
... Yeah, I just realized that I know way too much about these games...