I enjoyed the games in Sony's conference more, but I'll give the nod to Microsoft for having a lot a solid games and almost perfect pacing. Of the conferences I watched these were my ratings.
Microsoft - 8/10
Sony - 7.5/10
Bethesda - 6/10
Nintendo - 6/10
Square Enix - 5.5/10
I didn't watch EA or Ubisoft's, but I'll assume EA was the worst again.