After playing a little bit on WCS, I have to agree - the current levels are an absolute disaster. As soon as human rework has happened and when we were testing new human with Zero and Cyber (I think) and then later with Wolf, I've already noted that this is going to be a problem. In a way, this is actually worse than what we had with bash because in most maps right now human is pretty much literally impossible to spot unless you:
1) Pre-fire on all possible camp spots.
2) The human player is kind enough to light a Christmas tree without actually hitting you.
3) Doesn't have a lace and get hits by ultimate
4) Plays like a retard.

What is worse 3 and 4 aren't even reliable methods as due to the visibility and extra health you may still easily lose. I think previous invisibility was fine (with knife or without) - it made human a very strong, reliable race available for everyone. The current levels is what encourages whoring and pretty much gives no chances for the new players (or gives them the wrong idea to play human only). What human is currently escalates average/bad players to actually skill level of "good" just due to terrible mechanics [Think: Deathwish].

I am a huge fan of imperfect balance and uniqueness and in general IBIS is a great place to get that experience and for most cases even if the race/playstyle can be considered OP [Think: molecule / nebula / dragonfly with bullet rain through the walls / vagas / other things people complain], they can normally countered by strategy, skill and knowledge of the mod. The current human pretty much works against that and I think it sends the wrong message to both the current players and the new ones.

TL;DR: I think that human currently is a little bit too overpowered (there's plenty of evidence just in this thread) and that the invisibility should be reduced in order to induce balance once again.