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I'd say I'm a 100, simply because I'm better than everyone here.
The best traits in a player are drive, natural talent, and competition. If you've got the will to play 20 games a night-- especially in a new format, you're simply going to know the best decks and the format better than someone who isn't. Natural talent for the game is just what is needed. You can tell who is a gamer and who isn't just by the way they carry themselves. Someone who is good a Chess and Poker could pick up Pokemon and probably be competitive at it in a few weeks. If you're a gamer, you're a gamer. You've got the flair, and love of the game, you'll do well. Someone with natural talent has an eye towards strategy and competition.
Speaking of competition, that's another crutial factor. If you play with other really good players, you'll all elevate your gameplay. Someone could break out a Sneasel deck at a local tournament and crush random after random. But if they try to take on a sophisticated metagame, you'll get smashed by either players who know how to beat Sneasel decks, or another Sneasel deck that's very finely tuned. A good deck just doesn't cut it in a great metagame, and when you work cooperatively with other good players, you can develop great decks that are suited to great metagames. You feed off of the other players, and it's obvious that the result is more than the sum of it's parts.
Sportsmanship is nice, but the way I see it, Sportsmanship is a term diffacult to define. Sportsmanship in a game with my brothers is a lot different than it is in a game with my Grandma. As is a league/pickup game, a playtesting game, and a tournament game. I'll trash all day during a "fun" game, because it's not really insulting as there is nothing on the line. In a tournament game, I try to be either friendly or simply serious while playing. Over all, however, I have fun playing. I don't play the same way against every opponent, because every opponent is not the same. I know when someone isn't going to appreciate a few jabs, and when it's all in good fun. Because if you're not having fun, why play?