the only complaint i've heard about the Mz3 is the AC sucks. The ride is probably softer than the P5, but it still handles well. Mazda focuses on sporty rides as opposed to balls out speed. There is a turbo kit in R&D for it by HiBoost.

The interior is really nice from what I remember from my test drive. The manual felt mushy, but that's because i'm used to the crispness of mine (new bushing/short shifter).

Like JITB mentioned, try www.protege5.com (also www.mazdaiii.com takes you to the same place). Another good site is www.mazda3club.com

quick google seach brought quite a few forums. (Googled)