Basically anything but quests (stealth quests, again, being the exception). The one aspect of Morrowind where skills truly come into play is your success chance to physically attack your enemies, your success chance to cast magicka, your success chance to brew potions, etc. In fact, the stealth mechanics are SO bad that at low skills you simply can't hide at a reasonable distance from NPCs, but at high skills you can hide in front of the fucking NPCs. Whereas Skyrim's stealth is overpowered, leading everyone and their grandmother to play as stealth archers, Morrowind's are infamously bad, where trying to stealth your way around a quest without having previously honed your skills by cheesing Mudcrabs, Scribs, and feeble tavern patrons standing near a dimly lit candle, will have you raped, gently, by telepathic enemies. This is made even worse because of Morrowind's downright awful stealth mechanics.

Without high enough stealth, you will be relying on extreme chance to complete these quests. The one major exception are the stealth-oriented quests.

Fighters Guild/Redoran: very few quests actually demand you to engage in opponents in physical combat, if any.

Mages Guild/Telvanni: very few quests actually demand your magic-oriented character to use their magic, if any.

Thieves Guild/Hlaalu: you can easily spam the Persuade or Taunt button to pass most of the quests oriented towards 'smoothtalkers'.

But even Morrowind's faction quests are a lie: We can see an immediate difference with New Vegas: whereas Morrowind's quests are separated between 'incloosive' and 'gatekeeping', New Vegas quests, most of the time, have specific skill checks to unlock different paths or rewards.

Faction quests, which are usually oriented towards your build.

Non-faction quests, which rarely demand something out of your build.

Morrowind's quests can be divided in two: There are many reasons as to why I find Morrowind boring, but there is one in particular that outright breaks the game for me. Morrowind is a game that, as opposed to what its RPG label and its 'open world freedom!' would lead me to believe, is a game that gets more and more boring the more I play through it. And I'll explain why, giving my honest opinion on Morrowind. The title says 'Morrowind' but I'm talking about New Vegas, so why is this the case? Because even though there's an initial hurdle to overcome in New Vegas (in my personal experience, if I can get past Novac I know I'll play the hell out of the game), in Morrowind I'm going through a constant initial hurdle. I always bail out just as the Hoover Dam battle is available.

In fact, I've never, ever, finished New Vegas. I can't honestly say I've 'replayed' New Vegas a lot, in the sense of 'yeah I made it to the end of the game five times'. I've always maintained that, had it used the original Fallout engine and given an adequate time for Obsidian to do the major things they planned (most important of which being 'fleshing out the Legion') it would occupy the #1 spot as the best cRPG ever made. Fallout: New Vegas is my definition of a diamond in the rough.

Playing a mage in morrowind