On level 36, normal difficulty, I found the final fight to be a little easy. I certainly couldn't stand still at the beginning and expect to live long, and couldn't let myself get surrounded and fight the Divine and 3 or 4 paladins at the same time indefinitely, but once into the main room with my creature summoned it was relatively easy to clear out the rangers/paladins first and then take out the Divine and Zandalor.
However, entering the Hall of Echoes I could literally fly into a group of a dozen Memory Eaters and sit still while they attacked, having a commander occasionally cast Fire Sphere to set me on fire, and not take any damage at all. In the arena I fought the Memory Eaters and summons first to maximize loot (not that I needed it or got anything good), and then took out the main opponent(s) for each round, with little chance of taking much damage, unless I got careless.
How does a complaint that having a lot of common opponents with zero chance of doing any damage making combat boring translate to a desire to have to fight every opponent repeatedly until you are lucky enough to survive or find its one weakness?
I did go after opponents a higher level than me a few times, and did have to reload and adjust my strategy, either just to try to take them out early, or because they were the only opponent left in an area and I figured it was better to try a few times than to have to come back for them later. Nobody is advocating that be the norm for combat, though.