You are definitely entitled to your opinion, but it boggles my mind that so many people rate Morrowind so much higher than Oblivion.  Combat in Morrowing was TERRIBLE and the leveling-up was no better than Oblivion.  I think many people are just more nostalgic about it (not neccessarily you) vs. Oblivion.  It almost seems "vogue" to bash Oblivion now, but it was the "second coming" when it was out.  Odd huh?
		
		
	 
I rate Oblivion down heavilly because it failed to deliver what it promised.  There was much ballyhooing of its AI, voice acting, etc, and they all failed.  Bethesda made the mistake of having the end game being an endless repetition of the same thing:  going through portals, fighting demons.  It got boring.  
Much of the hype was due to reviewers playing for less than ten hours.   It took some play-time to come across the problems.  Oblivion was also too generic for me;  I liked the exotic setting of Morrowind much better.  Movement and combat were better in Oblivion, but the level up thing was poorly set up.  And Bethesda's continual bug ridden releases  and poor record of acknowledgement and fixing of issues came into play as well.  In this gaming household, Oblivion wasn't on any of the computers two months after release.  Just recently did the full on mod heavy re-install of Morrowind, and it is beautiful.  But the movement/combat issues are more evident.
I rate DA:O up because of a number of successful features.  Great characterization, stellar voice work,  depth of background, spin on the old fantasy chestnuts of elves and dwarves, etc.  I am not a huge fan of fully voiced games, but DA does it well.  Combat is fine by me, but I am not a fast twitch FPSer, so I can see issues if that's your favored style.
Different tastes lead to different opinions, certainly.  Hell, I still fire up Moo3 on occaision, and if there was ever a double dyed dog of a game, that's it.  More fun for me than solitaire though.  It's an awful game and its faults are numberless, but it's still amusing personally.  ;-)