As others have pointed out, there's a lot to hate about ads since the industry is routinely dishonest, insulting, obnoxious, deceptive, intrusive, and all manner of unpleasant. I've been adblocking religiously for most of my life for these reasons.
So I think a more interesting question might be the other way around: "What do you like about commercials?"
The only commercials I've ever liked are the ones for local small businesses. The ones with a nonexistent production budget that aren't beating the viewer over the head with blatant lies or dishonest sales tactics.
Adult Swim used to have faux-ad bumpers for the fictional business "Strickland Propane" from King of the Hill, featuring the honest-to-a-fault character Hank Hill as the spokesman, which I felt captured that vibe well.
Rhett and Link also made a funny homage to these kinds of commercials in this classic skit: https://www.youtube.com/watch?v=vnOyMSEWNTs
In terms of design, I find Lemmy to be basically a 1:1 replacement for Reddit. It's a link aggregator with communities, comments, and voting.
I like it a lot, even though the communities are smaller and there's less content. It's just a nicer communal experience for me compared to Reddit. I feel more pressure to actually comment since the communities are smaller and every little bit helps, lol.