Mixed feelings about this
I think it was unavoidable, MS had no choice but to buy Nokia as they had become WP8 - what do you think would have happened if nokia had turned around and said that they were no longer going to support WP8 and were moving to Android (just for an example), MS would have been in real trouble with no HW manufacturer, so they had to do this.
The bad bit is that I feel Nokia actually pushed MS to get better about WP8, they were under pressure to sell more phones so used the partnership to improve the OS to sell more. I love the fact that I was always getting a constant stream of Nokia based updates for my phone and I felt that their exclusive apps added value to the OS and I can't see this continuing in the same way now that Nokia are part of MS, they will be absorbed into the MS culture and just run to the same tune as the rest of the company.
Nokia and MS made each other better as partners, as part of the same company they won't push each other in the same way and we will lose out.
MS had no choice but to make this deal, we will have to wait and see how it works for us..