My last phone was the Lumia 1020, the one before that was the Galaxy S i9000. The two experiences could not have been more different. When I got my i9000, there were few good applications, but progressively their number increased and it became a very nice system to use indeed. The 1020, on the other hand, came with some nifty things out-of-the-box—I really enjoyed Photobeamer and the free 30GB OneDrive option—that Microsoft killed, while third-party support continued to dwindle over time. One got better, the other got worse.
They have a few nice ideas in Windows Phone 10, but none of them makeup for the certain doom the OS has been heading towards the past couple of years. It's a mediocre experience at best and doesn't offer anything worthwhile that iOS and Android cannot do better.