I like the 1996-1998 Cobras, but the GTs don't do anything for me. I don't think anyone will argue that the Mustang II was the worst of the bunch, but the 1994-1998s just bored me to death. I felt like their design was just too "soft." As for the 1999-2004, I think they look like a mish-mash of parts. To me, they look like they had 20 different people design this car and they tried to tie in all of their different designs into one. The headlights don't even fit in the body right, sort of like those on the latest of the Chevy Cavaliers. They look like they fit wrong parts.
A lot of people may disagree with me, but I think the Fox design has aged very well. There have been numerous design updates from 1982-1993, and all of them looked fresh. IMO, the 1985-1986 GTs look really good with that "slanted back" front end on them. Get a nice paint-job, some wide tires in the back and skinnies up front, drop the
suspension a little bit, and those cars just look badass.
Getting back on the Camaro, it's a stale design. We've been seeing it since 2005. When it came out, I had already been looking at it for 4.5 years, and it just fails to evoke any hint of emotion from me. To me, it looks like a ridiculous cartoon.