Truthfully, BO doesnt have outrageous imbalances. But they played it so safe, its the most boring CoD in recent history. Most weapons are clones of each other. Most maps are boring without any strong underlying theme and structure. The leveling isnt nearly as fun as it used to be. Everything they fixed by making it more boring instead of a new idea thats something exciting. Any new and refreshing ideas they did have (wager match and theater mode) are shoved off to the side in case they taint the experience IW crafted. Honestly, CoD is IWs baby, and treyarch are still the B-team. They dont seem to fundamentally understand how their own game works, and are afraid to mess with the magic. Id rather play a fixed MW2 than BO, but it'll never happen.
I don't think it's boring at all. The core gameplay has remained the same throughout the past 3 games; BO just eliminates most of the bullshit and nonsense that IW introduced with MW2.
I like the way the weapons are set up, it's nice having a bunch of choices instead of being locked into only 2 or 3 guns that I can stand like in the last 2 games.
I'm fine with the leveling as well, this is the most I've prestiged in COD yet.
Guess it's just a difference of opinion.