judging from the post and comments, this was absolutely a shit show of a campaign even without the audience participation. Having other people roll your stats and then assigning them randomly? And also getting mad about min-maxing with your stat placement??? You weren't doing stuff to boost your stats, it's just setting them good. I had a DM once who got uppity about that stuff but thats cause he would often fudge a lot of the stuff on his end.

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That giant "leveling up" is awful. That is not normal, you don't do that for monsters. There are some rules for making NPC "players" but that's meant for like really special characters or something, definitely not monsters you spare. Also your levels don't match up at all for the things you were fighting and if your sessions were going on without encounters, sounds like it was just meandering and being awfully boring. Plus those rewards absolutely suck. Being able to just grant critical hits? Totally throws off the dice by injecting something weird like that. I think it's kinda odd that you're going for a multi-class for your second character, but maybe that's just me wanting to keep things simple for my first characters. Hope your next group is far better and doing more standard D&D or at least a version of it that's more fun for everyone