I mean to steal from the top comments on the linked thread... That's what MODOK looks like.
Sure the origin is different, but that's ok. I wish he would have stuck around longer, but he's probably too silly to really fit in with the rest of the MCU as established.
Besides there are so many things to complain about with this movie, an Ant-Man film that drops all their fun side characters, Bill Murray is wasted, and of course the big bad of the whole era just so easily defeated, just to name a few.
But this movie had fun scenes with the ant army, the various goo people, and just Paul Rudd being Paul Rudd.
Ultimately this film fails because even though it was just "ok" when watching, it ultimately goes nowhere. We're just coming off Phase 4 (if phases matter) which is disjointed and didn't really have a purpose. Here is the start of KANG... and he sucks. Teased in the Loki series, then something mysterious at the end of Shang Chi, Spider-Man and Doctor Strange play with the Multiverse, and now... a whimper.
Now I realize there are outside forces at play here, and the plan is for Doomsday to pickup where these loose ends dropped, but it still sucks.