I could just as easily say that Sims 3 must be so much worse than I thought, because of your own efforts to make sims 4 seem to be worse than sims 3 :)
As for the reasons why some dislike sims 3, that depends on the player. To me the sims in 3 aren't nearly as charming or believable as in TS4. But no reason I give you will ever stop you from claiming that Sims 4 is much worse than Sims 3. Because you clearly have already made up your mind that that is the right answer. And that is okay. Because it won't ever make Sims 4 any less fun for me.
I play sims 4 every day. I don't need to be convinced on it and neither do you @JoAnne65 .