Blech, did I really say Obsidian? I meant Ebony. Anyway...
Players who want to min-max will do it in any game and reduce it to one "optimal path". That's a flaw of humanity, not game design - gamers will do it even if the differences are so minute as to be irrelevant.
... The ebony dagger choice is an egregious example, and fairly singular. There are ways you can exploit the character generator, yes - the "take a weakness to something you have a racial immunity to" trick, for example. But the game isn't so hard that any reasonable build isn't going to be viable.
Daggerfall's first dungeon feels like a puzzle, like many things in older CRPGs. Unless you've fucked around to know it by heart, then you can just make a build that can push through it like nothing. The wisdom of past players guide many new players, but people who play Daggerfall blind often bitch that they can't get past the first dungeon.
My main issue with the later Elder Scrolls games is that your character can do everything, and join every faction. While it wasn't executed the best, having the thieves' and fighter's guild being in opposition in Morrowind was an interesting idea and I wish they would have expanded on that idea.
Like many things blamed on Skyrim, that was there in Oblivion. Before I gave the Amulet of Kings to Jauffre, I became the leader of the Mages' University, the leader of the Fighters' Guild, the leader of the Thieves' Guild, the Listener of the Dark Brotherhood's Black Hand, the new Sheogorath, and the lead crusader of the Knights of the Nine. I literally had a monopoly on every professional fighting group in Cyrodiil outside of the fucking Imperial Legion, and I also lead the Legion's magical branch.
By the time I gave the Amulet to Jauffre, my character probably had enough minions and personal power to wage a war on her own. She could've probably crushed the Mythic Dawn and a good number of the Daedra invaders with all her minions, if the game allowed it. I mean, imagine the Shivering Isles Daedra invading Dagon's Deadlands, backed up by assassins, crusading knights, mages, professional fighters, and some thieves who can steal important shit from the Mythic Dawn. Like say, stealing their sacred book and getting back the Amulet of Kings.
In Skyrim, at most, you're the leader of a dilapidated mages' college, a small gang of werewolves, a small but growing Dark Brotherhood, and the strongest guild you'd have is the Thieves' Guild with power in each city, which is essentially the Skyrim version of La Cosa Nostra. If you chose the vampires in the Dawnguard DLC, you have a castle of bloodsucking killers at your disposal. And maybe a dragon or two. If you rebuilt the Blades, you'd have them too, but most folks don't because the Blades are assholes that try to get you to kill Paarthunax even after he's tried to atone for his sins.
Compared to the Hero of Kvatch, the Dragonborn isn't as influential or as powerful. It's like comparing a mafia don with some regional influence to the leader of a massive private army that can defeat professional armies from other countries. If the Dragonborn is Vito Corleone, the Hero of Kvatch is Senator Steven Armstrong.