There are almost no lazy "go get me 12 turtle shells" quests in the Witcher 3 and you get to experience some amazing writing even in the most obscure side quests.
Developers have taken great care to make an interesting story, but what really pulls you in is the dialogue and character interactions. They're made great through excellent writing, stellar voice-overs, and great body language. The characters on-screen may feel like real people, so it's very easy to forget you're playing a game and not watching a TV series.
The Witcher 3 has three completely different endings. The decisions during main quests and side-quests affect how the endings play out, adding up 36 possible outcomes. It feels refreshing to actually impact your character's fate and not just trot along a path to an inevitable conclusion.
The Witcher 3 is how an AAA title should play, sound, and feel like. Its deep combat, beautiful graphics, amazing sound, interesting quests, immersive story, and almost every other aspect of the game has a surprising amount of polish.
The world is intimidatingly massive but thankfully there are ways to cut down on travel time. You can ride a horse, use a boat, or just simply fast travel to explored locations. This makes the experience more accessible and enjoyable as a whole.
The total size of Witcher 3's world is about 52 square miles, which is 3.5 times larger than Skyrim and 1.5 times larger than Grand Theft Auto V. Thanks to the sheer size you feel like you're in a real world and not a constrained box.
If you happen to enjoy doing side quests, you might end up overleveled for the story quests, allowing you to easily power through them. This may remove the challenge and enjoyment, causing it to feel like a chore, especially because the loot also remains low-level.
Bethesda Softworks has upheld a tradition of releasing their internal content-creation tools to the public since Morrowind (2002). Many modders transition to new Bethesda games as they are released, bringing their experience with them and helping newcomers through forums and wikis. As a result, Skyrim's mod selection is outstanding in both variety and quality.
Skyrim inherits the stories and world-building of The Elder Scrolls series, which stretches back 20 years. It has numerous stories surrounding the various races (orcs, elves, lizardmen, demons, etc.), mythical beasts, gods, cataclysmic events, parallel worlds, and just about any fantasy trope you could think off. What's even better you can read the lore in books found in-game, allowing you to immerse yourself for countless hours.
Skyrim has no set character classes or equipment/spell limitations. Instead, it allows you to form your own class based on how you decide to play.
For example, sneaking increases your sneaking skill, hitting an enemy with a shortsword increases your one-handed skill, taking damage while wearing leather armor increases your light armor skill, and so forth. You can you play however you want and the resulting character will be a perfect match for your playstyle, giving Skyrim a different feel from other RPGs.
Most of the time you can just whack an enemy until it dies and it involves very little strategy or planning to succeed.
For example, targeting specific body parts doesn't deal extra damage, nor can you cripple an enemy. There are no vulnerabilities, so you can't set furry forest animals ablaze easier than humans. The enemies also lack any real variation in how they attempt to fight you – they just run at you swinging wildly or attack you from afar.
Because of this the combat is very one-dimensional and can start feeling like a chore after a while. Luckily most of the combat issues can be fixed with mods, allowing you to enjoy a more varied and deeper combat experience.
Depending on your race, your profession, and a few other choices you make when you create a character, you will have a unique story arc that unfolds with you as you level up.
Mounts that have been added with the Path of Fire expansion makes traveling across the world super fast and each mount feels unique in the way they are handled.
Combat is a bit basic with no information on enemy health and not much in a way of enemy AI. Bad guys will just go straight for the player and all one can do is hack and slash until all are dead. Over time this become quite boring and annoying as there is really no depth.
Leveling ones character works through what actions one performs. If a fighter and one fights a lot, they will gain experience in fighting, if a mage and one uses magic a lot one gains experience in magic.
Morrowind is one of the first RPGs to level in this way and is now a staple of the franchise.