The EA are not 'so great' some people just get a bit annoyed cos Mongoose do so much for the EA fleet while adding little or nothing to the other races.
Personally I think Mongoose should stop poking the EA and making sweeping changes. Little tweaks here and there are one thing but there is a limit....
As for the examples:
Minbari, are actually fair in my oppinion but a little hit and miss depending on how the dice go.
Centauri, sorry but theres no two ways about this, the Centauri, if they go for the beam armed ships and varients are just too good. The 'Beam Team' can be beaten of course but its bloody hard and really doesnt make for a very interesting style of game.
Narns, are fine.
ISA, shouldnt really give Earth too much trouble. Interceptors are VERY effective at stopping white stars inflicting damage and you can field LOTS of fighters. WS HATE fighters. Victories are just scary but then thats hardly a specific problem only EA have
Dilgar, are actually a very nasty fleet if your opponent knows how to use them right. Otherwise theyre interceptor fodder. Also the Dilgar need to exploit their superweapon. It starts with Tag and ends with Rath.....
Lastly Drazi. Drazi can work very well again but they are not as straightforward a fleet as people think and thats why they lose alot of the time.