Many years ago I actually made a video on the idea of campers/rushers. In a good multiplayer experience I think it's a good thing to have both kinds of players on both teams. You need campers to hold objectives and/or strategic areas of the map and you need rushers to take objectives or locations. I don't think it's wrong to camp and I don't think it's wrong to rush - it depends on how you do either of those actions. If you're a camper that just hides in a random corner and isn't defending a choke point or an objective...that's annoying. If you're a rusher that blindly rushes about bunny jumping everywhere and complain when you die...that's annoying.
Generally, I consider myself a rusher in most games that I play. I like getting into the action. The difference between me and most other players is that I let what's happening around me dictate my movement like in that video above.