Personally I have boxed teams of 2 and 3 before and level'd lots of solo characters but my experiences on my 5 teams have been horrible.

The server I am is very populated (most of the time there is a queue to login) and from 20 - 40 I have constantly been targeted by level 70's. Some times I've even ended up with 5 - 10 level 70's from the same guild who have just traveled to come kill / play with me.

Generally the trick I find is to make it appear like your not fussed, if you know you can't kill them and are going to be camped, either res and just walk away - see what happens ? or if they don't go after 10 minutes I generally spirit res and go into an instance for a run or two.