MangaFox, Mangahere, Kissmanga, then Mangadex, in that order, I think. Like others have mentioned, I actually enjoyed the tsukkomi features of Mangahere, because it felt like you were getting excited with everyone else. Then they got overrun with ads and I preferred long format, so I switched to Kissmanga. Lo and behold, I started getting malware and drive by download attacks from their advertisers, so I knew I had to switch again. I heard about batato just as it was shutting down, so I waited to see if there were any successors because I loved the concept. And so, I actually got to see Mangadex come into being! Didn't create an account until a few months later, though.