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Red and Blue: I love 'em for Nostalgia factor and for what they did for on the GB at the time, but the game has not aged very well. Not bad, but the glitches and how sloppy it is does bring it down.
Yellow: Same as above, although the updated sprites are nice.
Gold and Silver: Great all around, although like the above has not aged well, johto had bad level pacing and Kanto was cut down a bit too much to my liking.
Crystal: Worst re-release in my opinion, feels a bit shallow if you played the above (Granted, the big feature with the phone connectivity being cut outside of Japan didn't help). Not a bad option if you never played either though.
Ruby/Sapphire: First bad games in my opinion, cut out a lot of great features from GSC and didn't have much to do afterwards + looked a bit ugly. A step back.
Emerald: Fixed a lot of issues I had with RS, and is superior to ORAS. Best way to play the Hoenn games in my opinion.
FRLG: Good remakes and added a lot of new content. Also fixed some issues with the Gen 3 engine and style.
Diamond/Pearl: I liked it, I know a lot of people didn't but it felt like they took feedback from RS and fixed a lot of the issues.
Platinum: One of the best re-releases, added a lot of content, added more storyline and lore, and had a great Pokedex.
HGSS: Best Pokemon game hands down. While it still has some weirdness with leveling, the amount of content + bringing everything Platinum did well and fixing Kanto really made me love this game.
Black/White: Not a fan of the region and the gyms were eh, but the new Pokemon were good, having no returning ones was a nice feature that is missed, and the story was interesting. Hated what they did with leveling though, and was a bit easy. Good concept, bad execution.
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