People who disagree most likely:
- Haven't played the previous games properly
Nope.
- Treat TES games like action-adventure games rather than RPGs, and thus prefer Skyrim for it's action
Nope.
- Love the setting more than previous games
Nope. I prefer Morrowind as a setting, to be honest.
I prefer Skyrim as a game because:
1) There is combat in it. There wasn't in Morrowind. The sword swung, the game did some invisible number-crunching, and, although there was no rhyme or reason why, it told you that you 'missed.'
2) There is more room character development based on the character, not their stats. I prefer characters to be defined by what they do and why, rather than their power level being over nine thousand.
3) It is more realistic. This isn't simply a matter of graphics. If Morrowind was brought up to modern standards it would still be less realistic than Skyrim. Most NPCs don't move, shops always stay open, there were not as many ambient creatures, and there was no interaction with objects in the world other than picking them up. No workbenches, no alchemy labs, no forges, etc.
4) More NPC depth. In Morrowind, some NPCs had a lot to say. In Skyrim, NPCs have their own routine, house, and schedule - unlike many of the encyclopedia NPCs that populated Morrowind's towns, who just simply stood there 24/7.