Personally, I thought DKS was the weakest (and I didn't play it until it was all finished off). It just seemed like a relatively generic ARPG. Once you got past the opening areas and were flying around, it just seemed like a every dungeon you went into to climb up and fight the boss was the same thing over and over again. It was like raiding the gates in Oblivion...they all felt like the same generic process with no real point other than to grind through it.
I enjoyed DD for quite a while, but must admit I never finished. I basically rage quit after I went into the castle early and lost my teleport while still having tons of stuff to do. I had been a fool and not made a unique save point for quit a few hours and once I found out I had to do without it until a point much later in the story, I was so pissed that I just stopped playing. Too much running around left to do and no interest in replaying 5+ hours from my previous save outside of quick save. Diablo-style click fests have never been all that enjoyable to me anyway, so it was always a battle for me to fight through the tedium of Diablo-clicking to get to the very excellent story and quests. No doubt, if it had been turn based it would be on my all time list.
