First off I'll say I hate genre tags as they're arbitrary by nature which defeats their purpose.
Genre tags are fine. The problem is, there's so much genre blending going on these days that many people cannot understand the difference between RPGs and action-adventure games.
I played Daggerfall for maybe... 5 minutes before quitting knowing it wasn't for me.
Then you cannot judge the game.
It's Bethesda's best RPG to date by far, so calling it an action-adventure game after trying it for only 5 minutes is ludicrous.
I played Morrowind and outside of having attributes and more spells the games are almost identical. They rely on the same crutch, they suffer from similar problems, and they fit more cleanly into "Open world games, with some RPG elements".
More attributes + skills = better character definition / development... which is really what RPGs are about. Also, Morrowind's combat is much more about the character and their abilities than the player's skill, unlike Oblivion and Skyrim. Characters are actually capable of failing. On top of that choices seem more meaningful - not so much in terms of the main storyline, but in terms of which race you pick, which factions you join, etc.
If you believe an RPG is nothing more than stats, leveling, skills and abilities than by all means you could classify almost any game as an RPG. If you believe that an RPG is a world that realizes the character that you create then I'd argue Skyrim is the most "RPG" like of any TES game yet.
RPGs are supposed to be all about the character or characters you're playing as. They should be as uniquely defined as possible, and everything they do within the gameworld should be determined by their stats.
Literally, all that separates the RPG genre from the adventure genre or action-adventure genre is the use of numbers to allow for character definition and progression in a gameworld that responds to who the character(s) is/are.