W/L means nothing, he could be a solo player and losing matches a lot.
Trust me, a disconnect rate works great in other games, people rather take the beating then getting a high disconnect rate. Its really not that bad as you think (if you don't ragequit that often).
The only time I quit is when I feel the lag and when I'm rubber banding.
I doubt you will have a high quit rate, 3-5% is ok, standard (includes when the host dashboards), but some players will have a 50-66% rate.
I would probably have a bad quit rate. I quit matches when my guns dont work, or I'm getting instakilled. I quit 3 lobbies last night alone, and suffered though a couple.
I will leave few matches also, but only when the connection is super bad.
I just couldnt get a lobby last night that seemed to be even playable. I could go 1.0 kd, but it was just me shooting people in the back by chance. Other than that it seemed like everyone was 800ms ahead of me and I had solid 4 bars lobbies.
This weekend I had some great lobbies and a lot of good matches. I get so frustrated with this game, lol.