Play with the Crunch channel and varying the gain, mids and presence knobs. You can get anything from light breakup, to classic rock to hard rock, from smooth to crunchy. Just a KILLER channel. With the gain up to 1:00 or so, varying the mids from 9:00-3:00 gives you a huge variety of tones (and gain levels as the boost kicks in over noon). The presence can be used to open it up or to smooth it out.
I keep repeating the same things over and over about this amp, but I'll say this one again, if it had either clean voice as C1, and the Crunch Channel as C2, and no other voices, it would still be the best amp in it's price range IMO. But the same could be said for Clean/IIC+ or Fat/IV or .... they are all great! But I know what you mean. Mesa has packed so much into this little beast, that EVERYONE is going to have a their "if it had Crunch on C2 instead, it would be perfect" type preferences.
Mesa made this thing SO good, that us users don't want to give anything up. I laugh when I read people say that they really want to be able to footswitch between all 6 voices. Yes, that would be extremely cool. But with volume and EQ differences, not practical. It's just that they've put SO much great stuff in here, we want it all at once. There are no "ah, it's not bad" or "yeah it's pretty good" channels in this thing. They are ALL not only usable, they are all GREAT. 3 years ago, if Mesa had released this but with clean or fat on C1, and IIC+ on C2, and no other voices, it would have sold like crazy, we'd all have gone crazy over it and we'd all be happy. Instead, they gave us so much great stuff, it's sometimes hard to choose which two we want to switch between. I flip them almost daily, and enjoy the heck out of all of them.