Really, the first cycle from Gergiev isn't too terrible at all. It's executed in that typically Russian, no-nonsense and generally quick manner. But some of the playing of the LSO is really quite good. I've kept (so far) the M7 - because I like the LSO brass in the finale - and the M8, which was recorded in St. Paul's Cathedral after they restored the organ. The mostly Slavic cast of singers is really quite good, and I like how the sound just washes around in the dome at the end of each part. It's not fabulous but there are far worse. Then again, I like Mahler 8 more than most people. I have a bunch of them.
But need? . . . really, do we need ANY of this? . . . let's just say "it's there" if somebody actually wants to buy it. CD's have become souvenirs from live concerts, mostly.