I loved the CTX era music too! The soundtracks for Leaner Legs, Cardio Kicks, and Circuit Max were perfect.
I like the Intensity series with the exception of a few songs ('Pina colada" and "Buttercup") Actually, I think Imax 2 music is wonderful.
As for Body Blast... very hit and miss. I really don't mind some of the recognizable songs-- I thought I would dislike them all, but I agree with the poster who described some of the songs as too slow and whiny. There really is nothing worse than a power ballad, in my opinion. I think a good driving beat is the most important thing, too. Kick, Punch, and Crunch definitely has it.