indeed, i think warcraft and LOK are both superior to GOW, GOW consists of a lot of large and very power beings, some of them hundreds of metres tall, zues can deal some powerful damage himself and most of them can more or less fly but Kain, Elder God and Raz can beat these down and by using Kains time and dimensioning as well as Raz' elemental powers can smash them
and Warcraft is obvious since the Titans in warcraft are enormous, they travled space creating worlds and are far larger than GOW's not to menstion have powers over Time as well as all types of others, and then we have the demons, Magrheridon/mannaroth..pitlords, dreadlords..Archimonde and Kil'jaeden are immensly powerful.
then it will come down to one of those LOK Vs matches, in this case all the demons will be likely obselete but the Titans are arguably going to be able to beat kain and Raz, it would be an effort of who can activate time powers first. Also the extent of the titans powers are actually debatable since the strongest of them, Sergerus was more or less destroyed or certainly defeated by Medievs mother..cant remember her name whos powers are also suspect, although ofcourse segerus corrupting her meant segerus got the 2nd to last laugh but hes now in the void if ime not mistaken, or at least his essence is.
As C. C. said, Ner'Zhul could most likely deal with any ground forces. He control the dead, and by that I mean ALL OF THEM.. With Kel'Thuzad and Anub'Arak by his side, and the hundreds of thousands ((and growing)) undeads that he has under control with a single thought.. That's only him.. Anub'Arak is a massive bug that can impale units in a long line.. He's highly resistant to all damage, with the only weak spot on his chest, which is quite hard to reach due the fact that his claws cover most of it..
Kel'Thuzad has the power to destroy anyone if he get the chance to do a 30 seconds ritual.. And he can do it from a mighty distance and over a large area.. He can also sacrefice undead beings to gain energy.. Since Ner'Zhul summon those like it was nothing, Kel'Thuzad can pretty much not run out of energy..
Ner'Zhul himself with Arthas as host can slay undead beings to gain health if he is wounded..
Anub'Arak can create armies of his own, by summoning bugs out of nowhere..
And that's only 3 characters, who aren't even among the mightiest in the Warcraft Universe..
And his loyan Sapphiron, a frost-wyrm.. A dragon who's breath can turn peole into ice..