From what I read (I haven't watch it yet), a lot of people don't like this version of Lex. From the trailer, I also don't like this version of Lex. Also I think most people complained about the disjointed nature, trying too much for too little time. From the trailer, I also have that kind of feel. Having said that, I do like Amazing Spider-Man 2, so I should have no problem with BvS as long as it got enough meat (as in amazing moments and cool fights)... except for Lex... I don't know if I might like him more when I watch BvS, but if it is more of the same Lex as in the trailer, then probably no.
People say there's too much stuff, but the amount of set up content for sequels is not that much for a 2 and a half hour movie, one scene, a few cameos*(and they even complain that the cameos aren't more elaborate too, which seems odd considering many are saying it is overstuffed). There are a few story threads going on in the movie, in part to set up the second half, could be better edited but I like the approach they took, and could follow alone with the scene transitions. Trying to better blend multiple story threads would've resulted in a far longer movie and is not that necessary, as mentioned it can be easily followed.
The thing is taking the set up stuff out would only have cut a small fraction of the length of the movie. Wonder Woman is said to be one of the best things in the movie, so I sure'd hope they wouldn't expect her to be cut.
As for Lex, it is divisive, some hate him some love him. I found him very over the top, and combined with the characterization*(his actions) I found it added a nice touch of WTF moments.
Overall one of the more enjoyable movies I've seen in a while, and one of the better superhero movies.
As I said one thing is saying it is not properly edited or you didn't like it. That's reasonable opinion. But things I'm hearing like "it's the worst movie ever made", a "complete disaster", "completely indefensible", well not only is that hyperbole but for a movie that I consider to be very good, seems questionable. As I said there are various camps that are probably hating it for their own reasons. But if you see the trailers say for x-men apocalypse, pay attention,
the comments made in those trailers can offend a certain group, and they might say they hate something even if it is excellent.