Man, these games are all pretty badass. Castlevania 3 I never really got into, even though I revisit the very original every couple of years. I love the Metroidvanias, and have played pretty much every Castlevania ever - just not to completion. It's my greatest failing, one Lolisauce picks at whenever I tell him I'm playing the games below.
Crystalis. The game was just made really well, and really forces the player to approach the game like a puzzle. Just don't play the raped/beaten/abused/molested/deflowered/left-dead-in-a-ditch Game Boy Color version. The only real complaint anyone can have is that some monsters can't even be hurt unless you hit the required experience level, to which I say - wtf slow down, this game is meant to be enjoyed, not swallowed. Seriously, I hit the level cap two dungeons before the end and I skipped an entire required dungeon by accident.
http://www.youtube.com/watch?v=c1xmB79Sn4M (This guy gets handled a lot for someone doing a walkthrough)
Kid Icarus. It's shameful that I keep playing this game over and over, but I love it so much. It's got action, it's got platforming, it's got dungeons to get lost in, and it has the two most annoying enemies in history - that screaming witch and the Eggplant Wizard.
Megaman 2. Pure rose-colored glasses. This game isn't really that amazing, I just know it by heart since it's the first MM I ever played and it's design is only (r)aped in every version after it, instead of improved upon like the Metroidvanias.
Vectorman gets an honorable mention, even though I don't replay it yearly. Megaman + the ability to shoot up?
I've been wanting to revisit Viewtiful Joe, also, but it's hard when I want to play Godhand even more. If you told me two years ago that another action game would dethrone VJ for me, I would have slapped you.
Edit: ALMOST FORGOT.
METAL SLUG! 2!