Here's a couple more:
.Annoying snare drum. Some drummer spamming a bad-sounding snare is just painful to listen to.
.The bassist's role in a lot of metal bands. Don't get me wrong, there's tons of great metal bassists, but in a lot of bands they just seem there for no real reason. Mixed too low, does nothing but repeat the guitar line, etc... What's worse is when the guitar sounds just as low as the bass. What's the point of even having one then?
That said, if the bass has a good tone and is mixed well, it works great.