Im not a diehard but a causal fan on someone like Love/Hate (own 1 album) whom im going to see this year but I wouldn't select their 5 bests songs according to Spotify - which a few people at these gigs seem to have done - and then moan about them not being played.
Id listen to the latest album - especially if the tour was called the same name as the new album - and assume id get mostly that with a few classics thrown in.

I dont have any pre-conceptions about a bands set list when I go to see them. I know if I see Jovi (as a diehard) im gonna get the staples - but i seriously dont care what a band plays - apart from WSYCGH! Haha.
Im gutted ive never seen them play WITW & STYG - my fav two songs of theirs but I wouldnt take to social network to voice my displeasure at not hearing them.

Too many people seem to have a set-list in their head and if the band dont play it they moan.

Go to the show and enjoy. You might hear a song for the first time you fall in love with.

Ive never seen Bruce play but if i did and he didnt play from the album that broke him in the UK - Born in USA - I seriously wouldnt give a flying toss.

Im seeing GNR in June. If I leave there without SCOM, PC, KOHD being played I couldnt care less.