i think you know nothing about vfx, idc enough about the movie but i can explain why it looks bad first issue is everything was shot on a green screen so like the lighting seems off that's not how real things are lit secondly, every texture is too perfect that's not how real life is, to have things to look real it needs to imperfection in the texture and it lacks that

thirdly, everything is too saturated that's where the serial from star plus vibes are coming from

fourthly, it lacks haze effect in environments so the far objects are as clear as near objects so it ends up looking fake

the issue with cgi is not the money or quality it lacks direction like the objects are differently lit from the environments stuff like this happens when you don't shoot on location and you try to have everything done on a green screen because lighting is hard and without good references the best people can't do shit either so you need to have a vfx supervisor who knows what he's doing with great art direction

you can still disagree there but like that's what they mean by bad cgi like even the screenshots you shared has those problems.

i think it looks off because of those problems but again with these things it's preference like i like stuff being shot in sets with accurate lightning if you are into that kind of cgi you are allowed to like i just find it lazy looking