I play YGO since it was first released in Austria with the first decks of Kaiba and Yugi o.o
Since then, I've played lots of the game, and in RL as well, but since some years I haven't really got the chance to play with someone in reality. I haven't found anybody who plays it anymore in my area aside from younger pupils, and it would look stupid for a 19 year-old boy to pick on younger ones with cards <.<
I own the latest championship game, but I don't really play Wi-Fi or anything at the moment.
There are two decks I use in RL right now (even if I can't play with them), an "Elemental Hero mixture" and a "Six Samurai/mixture" deck, with main spots on warrior-type monsters.
The main deck I use in the 2010 championship game also focuses on the Six Samurai, but I found a way to make them even more useful o.o:
since the Six Samurai support each other, they are harder to destroy, and this works pretty well for Synchro summons. Try it out, the Six Samurai rock^^