Picked it up today.
Just like the beta, I was not too crazy about it at first, but then it grew on me a LOT.
MP thoughts:
-These aren't Ghost Recon maps, but would be pretty darn good Rainbow Six maps. Small to mid size, but a lot of layers and options for getting around (other than Pipeline). I can adapt with that in mind, I love some Rainbow Six.

-The guns really are satsifying compared to the other games. Nice and punchy, great options
-We played in a private room of friends, unfortunately limited to 12 on console (we could easily do 16).
-Private rooms have all equipment WIDE OPEN the way it should be. It's odd to be so acclimated to having to unlock crap that it felt strange at first, but became natural again quickly. There's a lot of good equipment and counters when you have full access.
-Played Conflict at first, which is not a bad game, but when we switched over to Siege, it became Ghost Recon again. The maps felt better, just a bit bigger, the pace felt better...simply had a great time with the game. I'd almost forgotten how much I hate respawn games. The tension was back, as well as the chance to BS with friends in the dead room. It wasn't just hectic shooter-land.
-Pipeline is still a horrible map, but there are some from the other end of the spectrum. The Cargo map was a nice take on the usual cargo ship map that comes up a good bit. The oil rig was nice, you had to watch all around all the time or you'd get taken out from somewhere you didn't even know was possible.
Campaign:
I only got to play for a short while, but got through a couple of areas.
-Briefings are back. I love briefings. I hate the "seemless game play" from the last batch of GR and Rainbow games. Then it changed countries. It wasn't Mexico! Oh yeah!
-Gameplay seems taken from Splinter Cell Conviction, with the same mark/execute type system from Vegas. The game looks pretty darn good. Might be a little washed out, but that's better than the Ubisoft brown we've become so accustomed to.
-The mission area was scored, which I like. I can see going back through trying to be more stealthy. My understanding is that the campaign is pretty short, so any reason to replay it is good.
Bottom line:
MP isn't as complex as the other GR games, the host options are limited, we don't have BLIND siege or some other favorite game types, but the gameplay itself is there. If we could ditch the perfect red outlines for spotted enemies, it would be a vast improvement, but otherwise the always-on HUD isn't as intrusive as it used to be.
I look forward to trying some co-op and playing a lot more MP with friends.
And I *LOVE* the stun mine. How can you not like 9 tasers pointed right where someone's going to come around a corner? Stun, hack, kill.

With Splinter Cell, I think Chaos Theory is one of the best all time games. Conviction was NO Chaos Theory. Taken on it's own merits though, I still like it a lot and play it. At this point, I feel similarly about GR:FS compared to the previous GR games.