I loved M&M. everything about it.
I also really liked D20 SAS. And I will diagree with the previous poster. I thought that the modern rules in SAS, were better at handling modern scenarios than D20 Modern - autofire, bursts, radiation, etc.
People didn't like it becuse it used the D20 mechanic, but varied some of the rules to much. If that makes sense.
I don't buy at all that they have little understanding. I thought they had great understanding. I just wished it was color!
I really liked it. It also has some of the best RP gaming advice you'll find.