Hard to pick only three, but here it goes:
1) Tron LE - I like the theme, music, dots, layout, rules, artwork....just about everything I like
1a) Tron Pro - if I hadn't preordered an LE, I would have been 100% happy owning a Pro
2) RBION - I like the hand drawn artwork and the quirky theme. Rules and shots are well done too
3) Avatar - there's something about this game that I continue to enjoy even after years of playing it. I got this as a preorder as well and its been in constant use. The soothing music, the colors, I like the simplicity of the layout.
runner up) ACDC Luci - awesome soundtrack and one of my favorite bands. I like the lighting, the shots, the multiballs. Cannon is cool, I love all the other extras on the playfield (including the cross ramp). Lower playfield is different in a game nowadays.