It's definitely a better Mahler cycle than most people think. Many people freak-out at the inclusion of Clinton Carpenter's completion of the 10th symphony, but why would we need yet another Cooke version (personally, I'd like another conductor's take on Samale/Mazzuca)? The problem in some of the recordings, including this "DLvdE", is that the vocals aren't the best (Birgit Remmert is really good on M3 though).
In addition, they are generally low level recordings, which means that you need to put extra gain on your volume knob to compensate. If you don't turn up low level recordings, they can sound quite dull. That aspect has nothing to do with what the person standing on the podium and waving the stick is doing. You can criticize that in terms of decisions made at the engineering console, usually with some input from the conductor. But just speaking for myself, I like the extra clarity at loud peaks that are the 'plus' side of low level recordings. The endings of M7 and M8 are great examples of that on the Zinman cycle. Also, I really like the acoustics of that hall.