Wizardry 1 seems pretty epic. I played for around six hours, and didn't even manage to map the first level fully, although I started from scratch once when - I suppose - a teleport confused me and I hadn't mapped stuff carefully enough anyway.
The game's rogue-like nature adds to the epicness, even considering that you can always attempt to save your dead party by using a new one, finding their corpses and dragging them back to castle where you can pay (exorbitant sums) to get them resurrected. (High level priest can do the same job for free of course, but that isn't much comfort for noobs.)
I should also say it's probably not as simple a game as it might seem at first. Already the first level is unexpectedly inhospitable to cartographers. Nevermind zombies that cause paralysis, I'm talking about complacently mapping the level, while suddenly being teleported - without notification - into a place where the only way out leads through a pitch black area that can't be illuminated. I noticed my map was starting to have considerably more width than it should have, so it was time to assume I had been teleported and cast location spell.
At that point I just wanted to get back to castle and didn't even attempt to map the pitch black area. Then I started messing up. It's entirely possible to mess up and get half of your already somewhat advanced party massacred in the process. To be more precise, I stumbled through the darkness into a room with buttons, so I pressed some buttons until a way seemed to open forward, and after killing a bunch of rather tough monsters I cast location spell and noticed I'm on level three, oops. Then I realised the room with buttons was an elevator. Then I went to level two to find a way to level one, and one of my characters got poisoned. If I recall right, cure poison is a level four spell, which doesn't mean you get it when your priest is level four, oh not at all (the character system being inspired by DnD).
I was starting to pine for a simpler game. I somehow managed to drag my ever dwindling party back to castle, and now I'm not sure whether it would take more or less time to grind for a few thousand coins (for resurrection purposes) than it would take to level up new party members. Of course I'll probably have to use new party members for that grinding anyway, so.... Might be a good idea to try one of those SNES Wizardries....
Still, if one adopts the same kind of attitude with Wizardry 1 as you would with ADOM or any other gigantic rogue-like, I suppose it can provide many, many hours of more or less addictive gameplay. I did enjoy it right up until I noticed the prices for resurrections.