I don't have an issue with payers who are level 6 and unskilled, because its very clear after a few waves, if they are good or not. Also, I understand that Hard is the best place to be casual and play, because its not to hard, but not too easy,especially if you have your perks up high. I'm just annoyed when its high level players who play on it and and are pretty skillful with their perk. Heck, during that match, I had only about 200ish kills, and the only person below me, was the demolition guy.
As for the thing with level 0/1/2 on HoE, Ive got to admit that i see that a lot, and I always assume that they are just lost, because some times they survive the first few eaves, but once the less common zeds start spawning, they die very fast. And the they leave shortly after.
Another thing that burns my buns, is when its the final wave and either half the team (3 people) go lvl 6 sharpy and get the M99 (way too OP) and gang bang the poor patty, or when the whole team goes support/demo and just spam the hell out of the grenades, pipe bombs and AA 12's. I mean, I'm sure that nearly all of the guys at this point, have the achievements, so why not try different tactics, besides the same old same old? Thats why I love tight maps like biotics lab, because I always go medic Xbow just in case things take a turn for the worse. Mainly, because I can easily outrun things, have good armor defense, can heal others from afar, and I can snipe patty if I'm the last person left.
Anyhow, what I'm trying to say is that I don't mind level 6 players playing on hard (anything below, is just noobish, and I do remember playing as a level 2 on normal and seeing level 6 pubstars playing with me, hogging all the kills and all the dosh), but when their the skillful type, and they have the mindset of "must get most kills, must be top of team", then it makes playing your own perk, pretty useless and difficult to learn from. And no, I don't have issues with casual players, just the ones who think that are really good and just refuse to move up a difficulty for a more fitting challenge
And on a side note, I was able to get to level 4 as support in the most glorious way possible. WestLondon, Hard, wave 8, as an enraged FP was approaching me, I unloaded my AA 12 onto him, while he smacks me once. At this time, I lost all my armor, and I was sitting at about 60ish health. Well, I reload, and he rages again. After two shots, i get the notification saying that I increased to level 4 for support specialist. So, my next 4 or 5 shots, were enough to kill the FP just as he was about to smack me again.