I am now a megaman fan i started playing the games in 2009, i got megaman 1,2,3 and 9 they all rock. but outside the original i have yet to play the X,legends or any other megaman series outside of just 1-9.
The Legends series is the best, IMO.
I like the X series and the original series about the same I suppose, but overall I think the first X is my favorite Mega Man game ever.
Zero is also a good series, as is Legends. Can't say I care about Battle Network or ZX though.
I've only played Megaman 1, 2, 4, some GBA Zero one, and one on the PS1.
None of them were that great but they're pretty cool.
Megaman X is amazing. and I'm playing through the Zero series on roms right now. it's hard as love.
I played the last one for the snes.
The one with Bass and Treble. That one is my favorite.