Solo vs. Elite Mobs

[MongoJerry]

Shadowpriests easily kill elites, on lower levels was soloing 1-2 higher lvl elites then me...

They're certainly better at it than holy/disc priests, but it depends very much on the mob whether a shadow priest can take down a particular mob. The obvious examples are the mortal striking elite demons in winterspring. Many classes can solo those guys, but no way a priest of any stripe can. They hit way too hard and you can only fear them once every 26 seconds if you have improved psychic scream. If you're looking to make a character specifically to efficiently take down elite mobs, priest is going to be far down the list.