Reminds me, one really big WTF-moment I had when I was the builder and defender of the base (human team), but my teammates camped or fed or something, however, they didn't really scratch the alien base. So I took matters in my own hand, teammessaged several times that I went out now and that the base needed defense, so I packed my gear, luci-nade-suited the alien base, did quite some damage, but when I came back, my base was gone, and I thought, well, erm… WTF?! And then: You f…ing retards, can't you get even anything done without me?
Being let down by the incompetence of your own team is really a bad thing to happen.