The Camaro shouldn't be small...the mustang's problems were, indeed, wieght...but also(and a big part too) crappy, over-rated engines. There is no competition, so as long as Ford made it look good, that's all they needed for people to buy it. The Mustangs are a joke.
3700 lbs. is good by me. The Vette is in at just over 3000, so add two more seats and I think 700 lbs is a fair difference. And the 2002 Camaro's came in at 3500, and still were friggin' awesome - right TAG, Moose? An 80 to 100 hp difference EASILY makes up for that!