I'm currently level 22 in Daggerfall, fully decked in enchanted Daedric armour and weapons, and about 1/3 through in the main quest. I'm taking currently taking my time doing all Daedric quests (already won Ring of Khajiiti, Mask of Clavicus Vile, Ebony Blade and Ebony Mail) and developing my character all the way to level 30 and beyond.
I nearly broke the main quest because I risked to go beyond the time limit travelling from the King of Worms' lair to Wayrest, but after reaching Master Wizard rank in the Mages Guild I can now teleport free of charge all over the place and I no longer lose time.
I also made a custom "Awesome Button" spell that has a 75% chance to disintegrate all enemies in a large radius (and it will be 100% chance at level 30), and because I picked Spell Absorption as an advantage at character creation I can restore all my mana points after casting it, meaning I can spam that spell forever. Yeeeaaaaahhhhhh.
Best Bethesda game ever, as far as gameplay and pure fun factor go (well, Failout 3 may come close though).