The fact that anyone thinks Skyrim's combat is even close to acceptable, is testament to how bad mainstream RPGs are. Even if people had played something like Tome4 they would have more of an idea what they are missing out on, or the old AD&D games, they would at least know what spells you can have. Time Stop, etc. The problem is that the average mainstream gamer only knows Skyrim and now Witcher 3 and that's all they think RPGs are. I could live with the boring exploration, terrible story, quests and voice acting, but weak combat is a deal breaker for me. I've played things that are so much better, I just can't go this far back.
For a Ranger build I would need to be able to have a movement buff spell, poison arrows, arrows that can't hurt undead, magic arrows that can, fire arrows that cause damage over time but heal any fire creatures, rain of arrows that hits multiple targets but lower damage, some way to ensnare the enemy so I can kite them around while shooting at them, an animal companion that has a chance to stun or knock enemies over, a coat of thorns that damage enemies that hit me, charm animal spell, calm animal spell, and preferably to work in a way that requires strategy. All this at the absolute basics, but preferably a lot more on top of it.
For a Mage I need to be able to control the pet. Attack my target, back off, don't assist me, wait here, etc. Basic pet controls. Mana should be balanced so you can kill an enemy but it is a tough fight. Direct damage spells that use a lot of mana, damage over time that are more mana efficient, some sort of aggro system so enemies will attack your pet unless you do a lot of damage and then they change target to you instead. Teleports/blink. Summon different types of pets that have different effects, a storm pet that slows the movement of enemies, a fire pet that damages enemies that hit it, a stone golem that is tanky, a wolf or something that is weak but does a lot of damage. Lifetap, poison, heals for the pet, strength buff for pet, wave of enfeeblement to weaken enemies, infectious cloud to poison or disease enemies, brief damage shield, etc. It should be balanced so that you are squishy and die in a few hits, but your magic is strong enough that you can survive if you play smart. A stun that stuns anything around you for 5 seconds to give you time to either ensnare and kite something, charm an enemy, sleep an enemy, or run away. You should be able to build the class in multiple ways, a pet focused one where you hide behind the pet and give him heals and buffs. Or an offensive magic build where you nuke stuff and use lightning blasts that stun enemies to slow their attacks on you. Or a trickster build where you poison an enemy and then vanish for 5 seconds and run across the room, invis fades and enemy comes running at you. Once he arrives, you teleport back to your original position. Etc... Gameplay. Stuff I've played in games 20 years ago. None of which exists in this retarded game of squirting fireballs out your fingers.