Animations take time and get old fast. Terminating inactive apps doesn't work right. Often you'll try to reopen an app (such as Preview) and it's stuck: finder

Animations take time and get old fast. Terminating inactive apps doesn't work right. Often you'll try to reopen an app (such as Preview) and it's stuck: finder thinks it's already open but it's not. So you have to force close it and reopen it. There's a lot of ideas in Lion & MLion that clearly should never have passed if there was a tasteful gatekeeper at the helm, but now everyone's a UX expert and it's a sloppy, half-baked mess of random, unchangeable preferences.