Crash Bandicoot is pretty great. Crash 2 was my childhood so I might be a bit biased, but it is still my favorite 3D Platformer, if not platformer in general, to date. I love Crash 3 just as much and I've actually gotten all 30 Platinum relics once. That took a lot of time investment.

I played Crash 2 and 3 too many times to count. I never played Team Racing or Bash because we never had them , nor did I play the first game until just a few years ago thanks to PSN. I didn't complete it though, just like maybee, I was frustrated with the lack of save points and when I had to redo a couple levels multiple times, it was too much.

I did play Crash 4 (Wrath of Cortex) and 5 (Twinsanity) and I'd say they're both still worth playing. Crash 4 still has the same layout and basic feel of the original Crash games, although the level design and difficulty aren't nearly as good. I also never got the final Platinum relic on what I believe was the second underwater level.

Twinsanity feels different in many ways, but it's still good. Its level design is quite good, although the level layout can be pretty confusing at times. A few times I ended up replaying parts of the story because I took a wrong turn. I also like the secret gems in that game, most of them are well-placed and not too cryptically hidden. Last but not least, the soundtrack is freaking awesome. Not necessarily because it's that great music, but because it's entirely acapella. It's wonderful.