I can sympathize with your DM, since in the group I played RttToEE, it was us - the players - who eventually pleaded to abandon it. And our DM had made a very good job to keep things interesting despite the fact that it is essentially one big hackfest. But after over a year (real time) of raids into the outer fane, and 3 or 4 characters per player gone down the drain, we opted for a somewhat more relaxed campaign.