I've read all of the books multiple times, and I'm fanatical about the Red Storm era of the games. When UbiSoft took over, things started going downhill. It began with Ghost Recon 2... you could see things were going downhill quickly.
The only thing that UbiSoft has seemed to do right is the Splinter Cell series, and let's hope they don't screw that up. The spirit of the old Rainbow Six is almost dead, replaced with those failures like Lockdown. Vegas was alright... but it's just not Rainbow Six as we true Tom Clancy fans know it. When we think of R6, we think of the truly tactical and engaging experience of the first three. Now, it's become a typical run-and-gun, linear thing. Online was -excellent- for Vegas in my opinion, but the single player... yeah...