I like the idea of a 'suggested comment time' at the end of a round. I'm not sure voting is effective, a lot of people just hit a number for the sake of getting the voting menu off their screen. (Or at least, I do... I'm a spastic voting button-masher.)
I don't think anything that might reduce the number of players on the server is a good idea, but I like seeing maps tested with full teams. Being able to kick pubbies for mapmakers that want to get on would be nice but a full server seems more important to me. Maybe encourage more people to test? Give them a "maps tested" statistic in the forum? I dunno.
To the original poster, as far as interpreting what happens during gameday, personally I try to be data-driven. How long does it take for people to accomplish objectives, how many points do various classes rack up, where are people dying without getting a chance to participate in a fight, etc. If someone says "too sniper friendly" but there are snipers on both teams who aren't scoring a lot of points, and people aren't switching classes to sniper... well... the evidence isn't there to start panicking and rearranging everything. This is why getting and watching demos is such an important part of mapmaking.
Also having a good internal filter is important. If someone says something useless, ignore it. If someone criticizes something, ask yourself "is that true? is there evidence for that conclusion?" Honestly evaluate their statement, try to put yourself in their shoes. Maybe they have a point that you haven't thought about. Or maybe they're wrong. The comments that make you think "Yeah that's totally true, I just hadn't thought about it that way," are the most valuable.