It's pretty good but I didn't like it that much, however everyone is different and most people do like it. It's pretty captivating, watch a few episodes first, you'll probably like it^^

I think it's worth seeing for yourself. =) Personally, I thought Attack on Titan was very good! the action was interesting and just the story in general was worth watching. But we all have different preferences. you should check it out for yourself and see if you like or dislike it. =D