This topic has been covered ad nauseum in threads throughout these boards by this point. Short answer? No. Long answer? You will almost always take a backseat to a similarly equipped guardian in a raid. You can be awesome at fighting groups, but raiding is an experience well above and beyond any standard grouping situation. Yes, you may be able to... Paladins -can- take just about any end-game mob with the right strategies, gear and appropriate level. A Guardian just does it more efficiently and with a greater success rate.