I'm bringing some friends along soon, we'll see if they quit after a week or two. They are new to FH2 at least. I can't remember if one of them tried FH1 back in the day.
I don't know if you guys are talking about daily quit rates or totally quitting FH2. Sometimes 2-3 rounds are enough, sometimes it's fun for hours. It helps if the teams are even a bit balanced at least in some maps. It's really taxing to go against frigging A-team round after round with a bunch of players that just can't get it done. I can sometimes compensate by going SL, but that pays off rarely, and often ends up with "f*** this" + Alt-F4. Then again, I often switch to the underdog team, so... guess I deserve it.
Quitting totally is something that shouldn't matter. This is not for everyone. Just like I get pissed off playing BF3/BF4, others get pissed off playing FH2. I don't see how changing 1s1k to 2s1k would help here. The new guys would still get mowed down the same.
This game is a rare gem in todays FPS genre. It should stay that way. More content, some bug fixes, little tweaks where needed and it's all good to me.