Cars do look the same.
The game is good but being an huge open world city there is a no reason (apart from sheer curiosity) to explore it.
I am wondering if they could of added similar things like your friends or mini games ala GTA IV? Or go to a club to see a show/singer, or gambling?
Even have Phelps have apartments and girls dotted around the city.
Althought its open world it is a tad linear.