GuitarBizarre

Neither of those things are true, really. The game is about taking expansions and whatnot.

Obviously in that context, the aim of the game is to acquire a larger army faster than your opponent, while striking a balance between the number of bases you have. Being too greedy leaves you with a smaller army, so you get rolled by people who build more units off of less bases. The reverse is also true. If you attack off of 2 base and someone on 3base gets a good battle, you can be really far behind thanks to his stronger production.

Its a lot more complex in practice of course, but its generally accepted that the aggression factor is more a byproduct of the way koreans use the tools they're given. The korean playstyle is significantly more attack based than most others.

Also, Terran aren't OP to an extent that anyone below masters league should care, if they're even OP at all, at any level up to Diamond league, its generally accepted that the race you play doesn't matter and your play has bigger leaks in it than race balance will fix. At diamond, people start seeing weaknesses in their own race more clearly, but those people frequently fail to compensate with strategy, instead whining about balance on teamliquid.

The game balance is constantly evolving, but at the end of the day, the best pros are taking games from all the races equally, so I'd say there aren't really any huge balance issues. There are some very, very minor ones that could possibly cause issues at GrandMasters level (top 2% of players, literally), but anyone below that level has bigger problems.