As far as I can tell his bad rep comes from his viper schenanegens many years ago and compounded by things like +1million venom which should probably be closer to 300k.
I think his actual modded cars are well done currently, but public opinion is hard to mend. I think the venom is an exercise in who cares, but the craftstmanship seems quite nice from what I have seen.
Somebody in txic sent his gt40 there for twin charging. He was happy with the results and it ran 220 mph in the standing mile.