It is interesting to see which players have good records or not, but it isn't the be all and end all. There's suicides that either pad some player's records or make others artificially worse, for instance. Subs can affect it as well, if one player makes a mistake that the other wouldn't have, or vice versa, but that's very difficult to quantify. Also, not all elements are created equal, and some pairings are more/less unfavourable than others. Team Life, for instance, as I've said a few times in chat, had the handicap of being forced to use 15 life cards in every deck :p The life element is weak, but that doesn't necessarily mean the players on that team are poor. That's actually why, if I play in War #5, I'll probably try to get on one of the teams that did poorly this round, to see how I fare in that situation.
All that doesn't even get into the random variables, like specific player matchups, how many generals/lt/soldier you faced, did the RNG screw you in the butt, etc. Against Dogg on team fire, for instance, I had one game where I topdecked a nova to take a game I would have lost and win it, I had another game where I got quanta screwed and had to discard for the first 5 or so turns and lost, and another game where I played my entire opening hand on turn 1; that's the RNG. Nobody could have won that game when I was quanta screwed, and nobody could have beat me when I got that dream hand. The one where I topdecked a nova might have come down to decision making in the turns leading up to it; did I do something smart to buy that one more turn, did Dogg do something silly to let me have that one more turn, or was the game a foregone conclusion (albeit with a very tense endgame) with the given draws we had? It's impossible to know now.