Was the first revelations any good?
Yes. If you remember it's a 3DS game. There's issues with it, but it's farrrrr better than RE6 which released in the same time-frame.
Didn't it also get released on PS3 and/or 360 later on? Anyone know which version gives the best experience? Kind of interested to play it.
It got released for PS3, 360, Wii U, and PC later on. They added extra content to the Raid Mode, which is the game's version of The Mercenaries, and really a better version of the main game. Revelations is broken up into levels, and clearing them unlocks them for use in Raid Mode. The settings are the same, but enemies can be different and there's different versions of them to fight, plus 'loot' drops and stuff to collect, as well as 2P co-op play online. Why this stuff wasn't in the story mode I will never understand.
Anyway, the best version of the game is without a doubt the PC version, since with a capable setup you can run the game at 1080P/60 FPS (and you shouldn't need anything too powerful to get that). The console ports are 720P/30 FPS.
I really enjoyed the game. The biggest complaint I have is that there's just too few enemy types (and again, Raid Mode helps with this a bit). Melee also works differently in that you really have to let into enemies and stun them before you can do it-- it's not like other recent REs where you can melee like crazy to win.