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I've rarely seen Kayle played tank... when I do, they usually are dealt with rather easily and you can just move on to the squishies. This is just from personal experience, though as I say, Milage may Vary. I say keep playing her for now, and try other tanks down the line, you may find you like Rammus or Morde much more then you like Kayle. Ultimately, she's a stepping stone to better tanking champs, though you may find you still like her over most tanks (or you may find you play her better then you do most tanks).