I've played this game for a while now, and the thing that really is rather irritating is falling through the floor every 10 minutes or so.
This happens a lot when shooting the Spiders (the normal ones, not the green ones).
Also, when out hunting in a team, every other person in the team seems to bounce a lot, like there trying to fall through the floor but not quite making it. The other avatars really do look like they are bouncing up to their neck into the ground, then bounce back up, usually about 5 times a second.
Taking a while to run to the Spiders, shooting them for about 10 minutes then falling through the floor, it gets very irritating.