There are those who simply repeat the tantrum that others do, so if you have an idiot saying that the game is boring because is balanced, many would follow.
More importantly, when it was the last time that the ignorant masses said something intelligent? Isn't one of the problems of this community (at least the online one) that there are many ignorants that spread bullshit of games that they don't know neither play?
And more importantly that are incapable of telling the difference of an opinion and a fact.
The balance is good and i actually belive that they achieved it well without needing to go the capcom route of neutering everything good of the cast and making them.
Many of the detractors of BBCSEX who actually put some thought on their reason, complain more about the length of the combos or that there were to many changes between CS to CSEX, also, there are those who complaint about the pace of the game, the movement is to slow, or simply they don't like the character design.
And for the last, those who simply don't like it because it is not GG/ NS fighting game of their liking.
Bad timing on the release, not being part of the evo line up, and that part of the community felt that it was a "bitch" move to release the game for only one character (Relius), despite that the numbers show that the major part of those who complained where also the ones who skipped the dlc characters waiting for the Revision with all of them, and that they (technically) got BBCS2 for free. I can go on, on why the BBCSEX was needed and was an intelligent move, but the masses are idiots (not saying that you are one, or that are part of the masses) and it would be off topic.