I own TRON, MET, AVATAR and TWD. I have read that some folks say Tron is not fun, and that always blows me away... kind of like when my buddy tells me he doesn't like a medium rare ribeye. I realize experiences may vary, I just happen to feel Tron is brilliant, truly walks the line of easy to understand hard to master, the others mentioned are great too.
Avatar is really a hidden gem, people mention the one ramp all the time, I hope they come around, would love others to have a much fun on that game as I have had. If you haven't played it, try that game with an open mind.. you may be very surprised..