I really enjoyed Underworld. Mostly I think it is because I'm a sucker for nice looking water in games and the first few levels really delivered. From there? It is kind of just fair enough but it got me to the end.
I'd put it right on the edge of what I want from a Tomb Raider game in terms of action to platforming to puzzles. The new Tomb Raider of course completely destroyed that ratio.
I played through the PS3 version back in the day and rather enjoyed the game. I didn't have much to compare it to, though, as it was the first TR I'd played since 2 on the PSX, haha.