More is technically a better guitarist than Blackmore and Don Airey is probably as able as the late Jon Lord. However, without their very distinctive sounds, I don't think of it as really being Purple. I saw them touring about 10 years ago when Lordy was still in the band but the new stuff was greeted with polite indifference at best.
There was a 'Classic Albums' doc on the other night about the making of Machine Head. Now that was an album. I had to find the CD and whack it on in the car after watching the doc.