I saw a girl that I slightly stalked my freshman year of college at the Fleetcenter the other night. Got a good chuckle of that. So I guess I should submit my own name here...
Waiting around the venue to get autographs and photos is okay. That is the time and place. However, "After" shows at the hotel is just rude. "Before" shows at the hotel could be alright.
I think it's okay to be outside the hotel or the venue. But if you are there all the time and then follow them to wherever else they are going, then it might be a bit stalkerish.
stalking anyone (be it someone in the band or not) is not encouraged on this forum. also, threads calling people out and personally attacking people (i consider calling someone a stalker a personal attack) is against forum rules.