With a few exceptions, I've never been a huge live album guy, and MTH are a great example. I love their studio albums and their live work didn't exactly blow me away. By contrast, I really liked a couple of Ian Hunter's live albums...go figure.
I love Heep Live, Made in Japan, On Stage, Pulse, X at The Whiskey, and a few other live albums, but I've always seen studio albums as the measuring stick for bands I like. I like it when bands get creative in the studio: Pink Floyd, The Who, Mott The Hoople, Foghat...(OK, I kid, I kid), whether or not they could fully replicate it on stage or not. To me, DP tried the hardest to replicate their amazing sound on stage and had Jon Lord's wall of sound plowing the way.
I remember seeing Kansas at MSG back in the mid-70's, and I was amazed at what was taped and playing through the live mix. Turns out that it really doesn't matter - it was a good sounding show, and I was never a huge fan. Good show or not, I really go to shows to hear good music amp'd up, but don't care much for theatrics. Hence, I've never given Kiss, Poison, Crue, etc. more than a passing glance - too gimmicky for my liking and their music was a weak manifestation of a persona they were trying to sell.