I am thinking about getting the game soon and a deciding facter is the controls are they floaty like Mercs 2 or do they now have weight to them also how does the shooting controls fare? 

I haven't played it, but from everything I've heard it's a little stiff

It's alright, reminds me of the first Assassin's Creed, and the vehicles reminds me of Mafia.

They're not bad, the stuff to get against walls isn't all that well designed though.
Other than that they're fine, the control scheme itself works pretty well, the left trigger changes a little to each situation.
I.e. if you've a gun out, then it'll zoom a little, if you're not using anything you'll sneak.
 
Works well, climbing is really easy if a little slow.

Im not a fan of the stiff vehicle controls. And the "iron sights" view is touchy as all hell (tho you can adjust that). Apart from that i find they get the job done. 

The controls from what I have played are total SHIT.  I am using my 360 controler on the PC version. When ever I hit the LT to go in to brawl mode it spins the camera as well. It does this while driving too. It seems like the default setup for the 360 controler is to have the same button mapped for different things. This is not cool and it just adds to how much this game lacks overall polish.  This game better get some major patches soon.  This game feels like it was rushed out 85% done. SAD I wanted to like this game. 

" The controls from what I have played are total SHIT.  I am using my 360 controler on the PC version. When ever I hit the LT to go in to brawl mode it spins the camera as well. It does this while driving too. It seems like the default setup for the 360 controler is to have the same button mapped for different things. This is not cool and it just adds to how much this game lacks overall polish.  This game better get some major patches soon.  This game feels like it was rushed out 85% done. SAD I wanted to like this game.  "

The controls are pretty good, I'd say. They're easy to learn, and everything is well laid out. They're kinda like Mercs. 2, but I'd say they're better still, as there's more you can do with them.