Maybe it's just me and I need to give it time but neither of these cars look good IMO.
the front of the Si looks ridiculous (first pic). It looks like some aweful body kit was slapped on.
And the rear of the S2000 looks bad to me. The spoiler (although functional...?) is aweful looking and I've never been a fan of the 'Nissan' style tail lights.
Maybe I'm just being picky but it seems these 2 cars have elements to them that most everyone has made fun of for being 'ricer' but since they're rare its acceptable....
Just my insight. Give me a while and maybe I'll warm up to them.
P.S. The hardtop on the S2K is pretty sick tho.

EDIT: Rims on the Si are sweet too...