Balrog is the hardest character to learn to play as well. What's the difference? One character being easier to use for a beginner doesn't mean the game isn't as balanced.
It's true that no fighter is perfectly balanced, but that doesn't change the fact that Street Fighter is the closest any series has came. If you ask me, the only fighter that could be considered as balanced as the Street Fighter series is Garou Mark of the Wolves(my opinion only though.)
Your mention of Guilty Gear, though? You must not know about the infinite combos that those games carry? Other than with Dhalsim, Street Fighter has no infinites. Let's not forget the amount of so called "combos" in Guilty Gear that consist of doing the exact same attacks over and over once you hit them with the first of that specific attack.
If you're a Street Fighter fan, you've most likely seen this. If not, you need to.
http://www.youtube.com/watch?v=v7cW2nMf1gk It's a video of Daigo Umehara, who's probably the best Street Fighter player ever.