-I don't hate Naruto/Naruto Shippuden, and I honestly think that the hatedom has become so dominant that calling Naruto 'overrated' is ridiculous. Even though that still happens, like all of the time.
-I really don't like Gintama. Well, it's
okay, but it receives far too much credit. It's proclaimed to be absolutely hilarious, but also really good for its emotional moments during its 'serious arcs'. However, it's not really that funny to me. It had its moments in the episodes I watched (with was around 60 episodes IIRC), but for the most part it was boring. Anime/manga that aren't humor-centric beat it out by a great deal.
The episodic nature of it combined with the hit or miss humor makes it very hard to watch. I only got as far as I did because I was open-minded and wanted to see what was so great about it. Even after one of the 'serious arcs', I was honestly not impressed.
-I despise fanservice. Fanservice alone will not make me dislike a series. I love One Piece like no other series, even though it has undeniable fanservice. However, other series go much further than One Piece, and when they do that it is very hard for me to watch the series. I don't want to be looking at massively oversized boobs, nor do I want to see panty shots. I am not attracted to cartoon characters. Much less cartoon characters that look like they should be in elementary school (aside from their oversized boobs).
-Perhaps not specifically an controversial anime opinion. However, I do not like the attitude of which many anime fans take against American cartoons. I enjoy American cartoons a lot, and the elitism of the anime fanbase gets on my last nerve.
Of course, the "All anime is bad" opinion is no better.