I've usually gone with separate outs from AD2, but the issue with that is that it messes up presets that are using fx and eq on AD2's master track (same applies with other drum vsts like Superior Drummer, etc.)  Even with the master out on a separate fader in Sonar, then you've got a parallel signal set up (I suspect this is what has caused me some issues with a "flanging" type sound using AD, thinking the plugin delay compensation gets screwed up?). 


I don't really use presets just as is, but sometimes they are a helpful starting point. If I'm really wanting to do that and also use multi-outs, I just study the preset and try to recreate it in the Sonar mixer.
 
EDIT: BTW, I was going to post pretty much the same question about drum vsts the other day, but then all hell broke loose!

Normally I use separate outs, pre-fader, and don't use the master outs. Each kit piece, room, and overheads. I have a template set up.

As said above it depends on the song and what it's for. For backing tracks I keep things simple and get by with the GUI mixer. I find the reverb sucks so if it's a actuall recording of a song I multi track it just to get better reverb and control the kick.  I find you have to be very carefull of the Room and Overhead busses as half the sound of AD2 is coming from them.  

dubdisciple
I know you can mix within AD2 and send single stereo output to DAW. I also know the built in mixer has effects, including parallel compression. Don't recall if it allows third party plugs to route into internal mixer

Nope. The only Drum Software that I know of that can do this is Platinum Samples' Drum player called Accent. Why all the big boys don't do this is beyond me.

Cactus Music
 I find you have to be very carefull of the Room and Overhead busses as half the sound of AD2 is coming from them.  

Yeah, I noticed the other day a preset for the Blue Oyster kit in which the kick and snare direct mics were completely turned down, everything was in the room and overheads, and a tiny bit to the fx sends. With Superior Drummer 2, I never really liked any of the presets and I always just started with a dry kit and mixed in the Sonar mixer. AD2 is different in that respect, as I don't think the various kits really have "default" presets of just the dry kit pieces. Superior Drummer 3 does include a lot of really good sounding presets, so I'm a bit indecisive about how to best work. Another issue, besides not being able to process individual kit pieces with 3rd party fx, is that I just don't like having to switch to the plugin window while I'm mixing.