Mortal Kombat and SF are easier to learn imo than Tekken 6.
Tekken's not too hard to learn if you don't really want to play it seriously. The early Tekken games are much easier to learn than everything after Tekken 4 (when they started putting in wallbounds/floorbounds).
If you want a good game to learn Tekken with (and have a PS3), wait a few months and get Tekken Hybrid and learn to play Tekken Tag Tournament. It's the basic Tekken mechanics without complicated wallbounds, and it comes with a demo of Tekken Tag Tournament 2, which is based off the Tekken 6 engine and has wallbounds and stuff. You could also just get Tekken Tag on PS2 if you can find it.
Tekken's not too hard to learn if you don't really want to play it seriously. The early Tekken games are much easier to learn than everything after Tekken 4 (when they started putting in wallbounds/floorbounds).
If you want a good game to learn Tekken with (and have a PS3), wait a few months and get Tekken Hybrid and learn to play Tekken Tag Tournament. It's the basic Tekken mechanics without complicated wallbounds, and it comes with a demo of Tekken Tag Tournament 2, which is based off the Tekken 6 engine and has wallbounds and stuff. You could also just get Tekken Tag on PS2 if you can find it.