Yes I think it is an openworld RPG.
It has an open world with emphasis on exploration and your character will level up, chose perks and unlock new powers(like the Shouts). Sure the traditional attributes are gone, but I don't see how that makes the character development any more shallow than Morrowind or Oblivion. Persoanlly I find more difference and development in my characters in Skyrim than earlier games.
The character development is one of the most precious things in Skyrim. Probably THE best part.
I saw a comment, where a dude was annoyed how simple the RPG Elements with Skyrim have become, only 3 values. This was simply the biggest sh... he ever thought of.
I was quite thinking the same way as he when i started. At first glance I saw only three values with Magicka, Health and Stamina. Wow, this was very daring.
But by putting the Oblivion character screen aside....after certain hours of gameplay I started to explore this part more, and I was very satisfied with what I found.
A complex character system effectively even outrunning Oblivion easily.
54 Skills 18 skills (sorry I dunno what RPG I was playing at this moment), which are going to level by use (much to fast for me, need a level mod). More than Oblivion had. Profession and the class-system are way outdated, if your char does improve by what he/she does.
Additionally the perks allow a fine tuning never experienced, since they are most immersible in the world of Skyrim.
But the most impressive part to me were the stones, which give you each the unique abilities of the different constellations, but they fully are integrated into Skyrim's world and gameplay.
Best work and design Bethesda did in a long time...if the other parts could only catch up...
PS:
Hand-to-Hand is still mandatory, and ...well it is gone...forgot about that.
And the Attributes were cut from 8 to 3. That is rather well done.
Sorry, but I was just thinking bout the new Character system to be integrated so well.