I've been playing my modded (mainly Requiem stacked on top of Duel, not sure if Duel retains any of its functionality this way, but it does seem to and it seems to work more or less) Skyrim lately and having a blast.
I love the AI overhaul, that lets NPCs to, for example pick up their fallen comrade's bow when attacked at range, that's with Requiem where bows can often onehit you unless you have heavy armour or tons of HPs, so it really reduces the effectiveness of "shoot the ranged attackers, then snipe everyone else" tactics. Of course, the highest threat targets are still the enemy wizards - if you're noticed by them, then your best beat is breaking the line of sight, thankfully no one can pick spells they have equipped.
Oh, by the way:
Requiem v1.0 is out, in case you haven't noticed.