Ultimately, only you can answer that. Apple has chosen a direction with the Mac’s GUI that is quite a departure from even the recent past. Lots of people love it, and lots of people don’t like it at all. I find myself somewhere in the middle.
When I look at the icons above individually, I like all the new ones. But collectively, when compared to the old ones, they don’t work as well. First off, Apple has chosen to go decidedly whiter with their icons. In a crowded Dock, they all sort of blend together. None of them are easily recognizable at a quick glance. Second, some of them make no sense. Take the new Photos app icon—what in the heck do a bunch of color blobs represent? The old iPhoto icon was clear in what it represented.
But it doesn’t stop with icons. The entire GUI has gotten lighter, more “blended in,” and sometimes confusing. Overall, I still love the Mac’s interface. Lately though, I’m finding more and more “little things” that really bug me.
Nicholas Windsor Howard has a great two-part article about the subject (complete with plenty of screenshots) that’s worth the read. Part one can be found here, and part-two here. Take a look and see if you agree with his opinions.