Here goes (I play imp, by the way):
1.) Depends on the time of day. I've had instapops, and I've had to wait a few minutes.
2.) Depends on the match. I've had close ones, been murdered, and slaughtered pubs.
3.) I've only had a few imp vs. imp matches. Don't play pub side, so no help there.
4.) I'd like to think so, although the best matches aren't because we have 12 great players vs. another 12, more like 4 good players vs. 4 good players, and everyone else is just filler.
Just to throw this out there, I'm pretty garbage, so take my opinions with a grain of salt.