Sniper only gamers frankly just aren't good at up close combat so they just sit back and snipe all day.
At least they recognize their weakness and capitalize on it but I do pity them.
I personally like the jack of all trades method, where you pick the weapon that best suits the game and situation you are in :)
There are only a handful of games that have balanced sniper rifles (TF2 being the best example), not that I'm complaining since I know how to get around them most of the time. However I've noticed that the sniper rifle is usually the casual gamers preference since its easier and more accessible.
Current Favorites:
Wii - Muramasa, MH3, Metroid Trilogy, RS2, Okami, RE4, COD, Dead Space, Scarface
PC - L4D, TF2, BFBC2, Killing Floor, Aquaria, Warsow, many UDK indie games
Mods - MechWarrior:Living Legends, Star Wars: Galatic Warfare, PVKII, Goldeneye Source, L4D mods
PS3 - Demon Souls, Way of the Samurai 3
Social Modding Club: ModDb | Steam