What, no mention for the great pick-up-and-play game that is Metroid Prime Pinball? All sarcasm aside, it's a fantastic pinball version of the first Prime game, and a fairly solid, if unorthodox, pinball game in its own right. I highly recommend giving it a try, if you can find a copy someplace.
As for the series overall, I also love how the latest Sakamoto games have made Samus more agile, but I absolutely loathe and detest Fusion and Other M's idiotic decision to limit where you can go next. I don't mean their telling you "go here next" (although I prefer the Prime games' approach), I mean their " you can ONLY go here next" idea. It's extremely un-Metroid to me. Fusion's otherwise good enough to overcome that, but Other M...is not. I don't think I'm ever going to bother beating Other M; the first four hours have really turned me off to the game. Glad I only spent $15 on it!