Got the CS:GO beta and I and learning to love it.
Has a more realistic approach. Still the most hardcore game in turns of punishment. But the feel and presentation has a more military feel. The hitboxes need to be tweaked a bit, as I feel I am not getting as many kills as I did in 1.6 or Source.
The new weapons are great and a nice addition. Guns feel more spread out and not just a AK vs M4A1 (OP'ed by AWP) match.
The models are lame but growing on me as the models represent the scenario, not just 4 models to chose from for CT and T. So I do enjoy that.
Maps are cleaned up a bit and like the new (slight) additions to them. Missing a lot of the older maps but we will see them in time, I am sure. Game seems to have more gravity to it and feels a little more 'heavier'.
For the first 5-10 mins I hated it, 10-40 mins I was mixed. Now I have played about 2 hours and really starting to get the feel back. It is a new feeling, and while I still miss the old CS. This is a welcomed exception, so far.