i played one of these, random crits were enabled and there was no whitelist or class limits, so after a mid of 6v6 classes the other team had a sniper then there were 6 scouts on our team (7 people, someone was subbing who didn't need to) after i played medic for this cancerous situation people started leaving and it died before the third round
needs some serious work but could be good one day. i would personally shut this down before it gets a rep as a total fucking joke by everyone before it's really ready to be used. I know some people had good experiences with it, but i have also heard some bad ones. I'm not sure if they're good or bad the majority of the time, but they definitely have more potential to be worse than tf2lobby.
the automatic sub thing is kinda broken, i tried to sub for a game and i joined one that was mid-way through with 6v6 and everyone had been in there since the start. servers absolutely need to have a config for competitive, crits shouldn't even be an option
even if it is just a beta, first impressions are huge. If a lot of people have a shitty first game of tf2center, and it is a bigger clusterfuck than tf2lobby, then it won't live very long.
also, i played only one and it was pretty late. I don't know if the person who set the lobby up just completely fucked the settings up and that is why there is no config, this was just my experience with it.