Not crazy about the seeming Infinity Stone error. This creates a huge cluster-eff when you think about amassing 6-googleplex stones.
It doesn't bother me to see Thanos get defeated so easily. The movies don't really use them like the books did. IG or not, he's still just a fleshy with fleshy lack of insight. He's not omnipotent or omniscient or anything like that.
Otherwise, the fighting was kinda cool, but there's no way I buy Natasha and Clint fighting off a horde of Ultrons as well as they did. Kind of eyerolling for me.
The watcher there looked like most powerful marvel being not IG holder, and wonder why he choose to go grab Strange, and not likes of a Galactus and celestials instead?