I play LLLLPr, all full geared T1 and one of the locks is full T2.
It's very fun to play, many usefull abilities, invocation, soulstone, pets for dispell and tankiness, dots, but i just leveled a mage team because i mainly play wpvp and Locks have a real lack of aoe damage. 3-4 people can kill you if they know how to counter you.
Mages just have to spam arcane explosion and it's ok.
Fun -> Locks
Infinite power -> Mages