The SK continues to be a fun class to play, and a unique design.
Up to ROK content, the SK is decent in tanking ability, and can dish out some nice dps for a plate tank.
SK's can also group tank the ROK instances decently enough.
Once you hit ROK, however, you will notice the other plate tank classes are more powerful. SK's are dead last in main tanking, off tanking, aggro control, utility, and survivability. SK's are second last in DPS.
That's right, you heard right, a Guardian can DPS the pants off an SK in ROK content. AND they have better tanking abilities. It's not even close.
Due to the obvious imbalance issues, you may find it difficult to obtain a spot in an ROK raid. But if you just want to run group instances and complete quests, your SK should do just fine 
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The game itself has come a long way in the last year or two, and the new ROK content is a lot of fun 