There's nothing wrong with liking it. Obviously this was Riot's intent, to release something to be enjoyed by fans. If you enjoy something, that is perfectly fine, who am I to tell you otherwise?
But I also don't think it's fair to shame people for disliking something. I think a lot of people have legitimate criticisms for the Varus lore and how it was handled. And that's good. Anything should be criticized to some extent, even stuff you like, because that's how we understand what we like and what we don't. What's good and what's bad. And how to improve. Riot shouldn't just expect criticism: they should encourage it, because they can use it to learn and produce even better content in the future. Obviously some will just hate to hate, but to chalk every criticism of a work up to that because of a few people is foolish. Most of these posters want the lore and every other aspect of the game to be really good, and that's why they are so disappointed when it _really _ doesn't hit the mark for them. They are as passionate about it as the people who liked it.
That's not to say everyone has to rush to their keyboards and type up a huge essay nitpicking everything to death, but everyone has a right to, just as they have a right to say they enjoyed it. Just don't dismiss dissenting opinions just because you don't agree with them. Many of the critics will even admit there is some merit to the new Varus lore, but that doesn't change the fact that there are certain flaws preventing them from enjoying it like you are. And that's ok. You might disagree and say those flaws are no big deal. That's ok, too.
Like what you want, just be willing to empathize with those of us that have legitimate criticisms.