I have ME3 on the PS3 in the UK and so I haven't got my hands on the Extended Cut DLC, however, I've watched all the endings on Youtube.
I feel much better about the endings. I still have a few issues but Bioware have provided more closure, even if it was just a slideshow, and fixed a few of the plot holes.
I cannot choose which ending is best though. Destroy, while most fitting to the series, has the saddest outcome (not including Refusal). Synthesis is the happiest but it is also arguably the most stupid (Space magic?). Finally, although I like the idea behind control, it is also very strange. God-Shep could easily go insane and continue the cycle and so it does not seem like a permanent solution. This is also true of Destroy as with the reapers gone, Starchild's theory that synthetics will destroy us still remains a potential problem. Refusal was a nice touch but it is too depressing.
So overall I cannot pick a favourite. What do you think, better or still annoyed and which ending is the your favourite?