Your method is certainly valid, Mr.Q, but you aren't suffering from the problem dachay is having, so unification isn't an issue for you. I was assuming he was recording dry as well, except for the differing natural ambiences of the different rooms. The only truly "dry" recording would have to be done in an anechoic chamber, which it turns out, whenever it's been tried, results in about the most God-awful recordings one could possibly imagine.
Dachay, while adding reverb to the whole mix might work if you're lucky, you still might prefer to have the control of differing amounts (or none at all) on certain tracks.
The way to do this is to use an aux send (or a stereo pair of aux sends) on each track to send varying amounts (or none) of each track to one reverb program (let's say a small room). This will be the unifying element in the mix.
Once you have that, there is no reason you can't add other reverbs (like a plate, for instance) to certain tracks, maybe to get a nice long tail on your snare drum for instance.
Good luck.
