I think the names themselves aren't even the thing that bothers people, more the fact that they don't suit the actual appearance of the sim. You can't imagine how many blond and pale sims I had with Asian names before I got a mod to get rid of these names.
As for me, my first unpopular opinion would be that I couldn't care less about pets. At first I thought they would be less stressful in TS4 because we can't control them, but no, they constantly have to fill up sims' queues (but I think this one's a bug).
I also don't care about babies being improved upon. It's the lifestage I'm caring the least about and I usually age them to toddlers asap.
Open world is another thing I literally hate. It makes rotational play impossible to do because sims from inactive households are constantly doing something which can mess up storylines badly. With a non-open world, this can happen too but less frequently and only when inactive sims are currently on the same lot.
Actually, I really don't care much about the popular expansions everyone is/was constantly asking for (Pets, Seasons, University). I'm SO glad the first two are already released so people don't annoy with this anymore. My most unpopular opinion still has to be that I really want a time travel pack like in TS3, one in which you can choose between the past and the future (but future is still more important for me).