Just played it for about two hours.
Pros:
1.) Graphics are very nice. P38 especially is sexy. Level design is very good, and there are multiple routes into the objectives.
2.) Climbing / mantling! You can even climb a 3 meter wall. This should definitely be in TW's next game.
3.) Two-stage sighting system; shouldered and fully sighted. This is great for pistols, but it still "feels" a bit strange, especially with the rifles. But it's a good idea. In RO you start walking very slowly in ironsights, but here you can still run while having your weapon shouldered, which is great for room clearing.
4.) The map looks cool, and requires you to check it in a safe place because of the animation.
5.) Staying close to an officer gives you advantages, although I didn't really notice them.
Cons:
1.) Movement feels very stuttery and stiff. Like everything is in slow-motion. Aiming is a bit difficult as well. Hopefully they'll be able to achieve the fluence of RO with Source.
2.) It was quite laggy for me, though it could've been the server.
Overall, pretty good for an alpha. RO players will have an advantage here because it's quite similar in terms of gameplay. But they need to fix the stuttery movement ASAP!