I've been playing D&D for years. But I started my tabletop rpg experiance with Battletech. Currently I can't find a group for either.
Virtually no one plays classic Battletech anymore and all the D&D groups around town are full... or flops.
With both games though I have more fun creating characters than actually playing the game.
@TT: Hmm... I think me and my group thought trying to get three 20's in a row for an instant kill is a little ridiculous. If your attack roll is a 20 that guarantees a hit, then you roll again to see if that hit is a critical hit, and that roll just has to meet or exceed their AC to succeed. Making a 20 on that second roll should be enough. Trying to make a third 20 is just asking too much... unless your dice are weighted.
I haven't played D&D in several months now. Battletech has been about a year or more. (Battletech I can set up mock battles and fight myself but I don't count that)
I have been told I'm a master at non-bias gaming. Meaning that I can run a 4 sided battle by myself and not favor a side... Same with D&D more times than not I had to bring in one of my characters while Dm'ing just to shore up the ranks or get the players out of a situation, and I've never been accused of catering to my character. Thats something I'm proud of.
The only other tabletop game I've ever tried is Vampire "The Masquerade"