Off-topic
Since when has Minecraft been an RPG? A few small RPG elements have been added but they're small at best but not in traditional RPG ways at all. It doesn't matter what you do in minecraft your character doesn't get stronger, faster, etc. There is almost literally no storyline what-so-ever. It's just a very very large sandbox creative game, to call it an RPG... that game isn't an RPG. It can be modded into an RPG like for example using adventurecraft but the base game just isn't an RPG what-so-ever. Even the new leveling system only works for enchanting items which are unrepairable and all have endurance levels before breaking.
Maybe in time Minecraft will add more and more and become an RPG but right now, no... it's not an RPG.
I was semi-joking with Minecraft, to point out an absurdity of the claim. Although, from my last check, it's a
lot more of an RPG now, with elements such as Enchanting and Experience thrown in.
On-topic
Knights of the old Republic uses a specialized/customized version of the D&D ruleset that many actions are actually played against. However the game while having a some what linear progression (ok you can decide to do like 4 parts of it in a slightly different order), is made an RPG more because of how you can do things differently within that storyline, in Skyrim you don't get very much of that and that's where skyrim is lacking in comparison to many other RPGs, Skyrim is just a go clear this cave out whereas other RPGs, even Oblivion had more to the quests themselves.
I've not seen this to be the case. There are several ways to do things differently within
Skyrim's quests. Diplomatic Immunity for instance.
Spoiler
You can kill all the guards with spells or weapons
You can sneak through like a thief with spells, stealth, or potions
OR, if you're an Altmer, and pack Thalmor Hooded Robes, you can impersonate a Thalmor Justicar
Other quests likewise demonstrate variables methods of performing them, and those within Faction quest lines, while "Smack it with a Stick" is usually AN available option, it's not always the best, and there are some points that require you to actually use the skills associated with the faction.
Skyrim DOES make "To Do or Not To Do" a significant choice: there are nigh-unlimited quests in the game, that you cannot be expected to do
them all. Some quests are mutually exclusive with each other
Spoiler Join the Dark Brotherhood and Wipe Out the Dark Brotherhood, for instance)
. And some quests you can simply say "Not my Style" and ignore.