I don't hate them, and actually like them quite a lot (give or take one or two). There are things I wish they would have done (most prominently, I was very disappointed that Phase 2 didn't culminate in Masters of Evil throwdown). If there is one thing about them I didn't like, it's the MCU's tendency to use "in name only" characters. Zemo, Hammer, Hela, Executioner, Ronan, Madam Masque, Strucker, Egghead, Cross. Many of them were too far from their source material for my taste.