I didn't say I didn't like it, but I know people that would like to use it but won't because it always has people there that are not 'casual' and spoil it for them.
Rank/Level doesn't have nothing to do with skill, but I agree it isn't a good indicator. It does mean that those players have more experience, though, and that does make a difference to how effective they can be.
I too am high rank and would say I'm little more than slightly above average :)
Limits based on SBMM stuff like rank and K/D and SPM (score per minute) would indeed be a good idea.
When I said 'pointless', what I meant was it has little use as a 'casual' mode if they do nothing to ensure the players are 'casual'.
A bit like initiation mode when they do nothing to make sure the players are noobs.