I don't understand the hype for Rebellion. I've listened to it a couple of times now and I simply don't get it. I'll just overlook the worthless production in the lyric video, that's obviously not their fault, but aside from that there's still so much wrong. It's like a very bad Muse song with worse lyrics. The vocal lines in the chorus are literally just yelling.... I mean, if you transpose this song into any other style it's immediately obvious that this song is utterly useless. Why do people like sub-par things when it's rock?
I agree that the song has some problems, the main one is that the second half of the song is the same as the first, it kinda works because in the bridge between first and second half the lyric says "Don't stop now you're having fun " and it feels like some kind of musical edging... Still, it needs a bit of polishing and unfortunately I doubt that there will be a revamp if they win.
The thing you pointed out about the chorus I don't agree, because the song was made to be sung at a big arena and the chorus is made so the public will sing with them, in the studio version the chorus doesn't work that well because there is no public with them.
Also I don't agree that it is a bad song because it would not work in another genre, most songs can't be covered in another genres, a jazzy cover of "Hatrid Mun Sigra" would not work nor "Love is Forever" as a metal song. "Rebellion" has a particular message and this genre is the best way to people to understand it.
I respect that you dislike the song, it will not be everyone’s cup of tea( no song is) and I don't think that it is the best song ever nor as masterpiece, but it is the best that Portugal could send this year and it will bring some variety to the contest.