The latest one, Pirate's Curse, is really good and criminally underrated. It's on PC, 3DS and Wii U and I highly suggest checking it out.
I know the GBC one has a cult following, and the consensus on Risky's Revenge is that it's just okay.
Uh... generally very well regarded and has 75-85 metascore depending on the platform.
Anyway, I found a few puzzles in Pirate's Curse to be painfully obtuse, but it was for optional stuff. Beyond that the gameplay is great and the story/characters are charming. If you're bothered by casual titty action (basically "cute sexiness", nothing explicit) then stay away, otherwise check it out.
The GBC game is dated these days but still fun.