First chapter:
-during the starting cinematic, the Sindorei Warrior portrait in the dialogue is the one of a guard tower. Easily change the unit speaking.
-a bit sad that Kael has the same default spells of a bloodmage. You could make some custom ones for him. The Mana Drain is also a bit bugged, might be related to the patch. The allied mana transfer is not working even though in the tooltip is described that I can.
-there is an option to force a map load automatically on SD or HD graphics without having to manually seelct it. Most people use the classic graphics and if they play the campaign on it, some additional bugs will bother them. For example, the bridges are literally invisible in SD.
-I like how the story of the campaign starts.
-the terrain seems kinda simple, you could improve it a bit more.
-the dialogues last sometimes too much
-the name of other factions could be changed into something more intuitive instead of default player 1,2,3 etc
Second chapter:
-Kael and his archers seem to be walking a longer distance from the entrance during the cinematic then they are instantly moved back near the entrance once it starts (minor bug though).
-The Mountain King has the same default abilities.
-Again some bugs related to the unit speaking during, kael was talking but it shown a ghost instead. The spirits talked, the dragon roost appeared in the portrait.
-Kael'thas spellbook seem a fine concept but I was expecting a stronger spell rather that just a town portal scroll for his first spell.
-the Magic Vault at the end of the chapter is empty once i destroy it. The spellbook pedestal was also targetable and I could destroy it. I was expecting a cinematic when he gets it.
Third chapter:
-both the human sorceress (mages as you called her) and the Paladin have the same default abilities as in w3
-if you venture with the caravan into the woods and mountains and the timer from the wolf attacks ends, all of your units are instantly moved back into the base. I understand that you wanted them to be separated things but you shouldn't turn on the trigger that allows the player to get pass through the gate and march with the caravan.
Overall, it does have a nice concept but it still needs a lot of work to be a proper campaign!
Set to
simple/useful
If you are not satisfied and want an additional review, you can simply ask @deepstrasz or @Wazzz for it.