I found more people pissed that they said he’d be in the movie and was basically a glorified cameo. I just personally think it would’ve worked better if his reveal had been saved for 8 instead of just tacked on to the end of 7 as a cheap cliffhanger.
I don’t think it is a “cheap cliffhanger”. The movie needed a bright point at the end to counter all the negative.
Compare with The Empire Strikes Back’s end scene. There was Luke being out of pain on the path to recovery, Chewie and Lando following a lead on Han and the Rebel fleet being safe - all positive things. Imagine how the movie would have felt without those things.
By the way, that scene is IMHO the only time in the movie where the music is really good.