I was almost 14 yrs old when Burn was released, thankfully I think I have aged well.

I'm sure most fans consider Ian Gillan as the "voice" of Deep Purple. But, IMHO, Burn was a fantastic album and the addition of Coverdale and Hughes was a seamless transition. But these two artists were only band members for three years (3 albums) in the course of a very long existence of the band. Again, IMO, DP's best and most successful work was produced by what's known as the Mk II line-up with Gillan. With that said, some of my favourite songs are from Burn, the band was able to continue without missing a beat.

I find it odd and don't know the circumstances of how Glenn Hughes is able to retain the name "Deep Purple." At least his live show only includes music from his time in the band up until present day.

Loved Mk 1 DP with Rod Evans, and of course Mk II with Ian Gillan, but I lost interest when Hughes and Coverdale came in. But I know a lot of people loved that lineup, too.... 

But Mk II came back. It was the 80s and they had a more accessible sound, but nobody equaled Ian Gillan.