It's getting annoying when they overdo it, or especially when they act like they are the fucking expert and you know nothing.
I have no problem with the partying or casuals getting into the game, but the latter part of your post is something that's annoying me. I keep seeing people talking about how the game is shit because of silly little things things like the timekeeping for injury time not being exact to the amount of time the game is stopped for during play.