Ltm annoys me sometimes too, but he really isn't being unreasonable here. He isn't saying that the show is objectively bad, just that if you are used to the comics pacing then it can be a bit jarring. The thing is, if you have read it, you know a lot of the major things that happen, you know most of the issues between the characters, etc. and that makes it seem even slower.
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I'm "kind of a big deal".
http://img.imgcake.com/cyclo/Cyclopngegpngre.png