I use Dragon for speech recognition all the time and it's pretty much 100% accurate, and I love it, so I thought this new idea of also using it for gaming was an excellent idea.
I didn't appreciate that it only covered a few games, so I was a bit disappointed. I was even more disappointed to find that it wasn't much good with the games anyway - recognition seems very hit and miss. Apart from anything else, it was only once I started to use it that I realised that speaking to make a game respond isn't a natural way of playing and seems a bit intrusive. Couple that with the mixed recognition rate, and it was a bit of a waste of time really.
I wouldn't recommend this as a gaming add on, but as it also includes a fully functioning speech recognition package, it gets 3 stars. But you'd be better off buying the straightforward Dragon speech recognition software really.