When looking for an experience very similar to the original Warcraft 3: Reign Of Chaos, it doesn't get much closer than A Year Of Rain. The influence and inspiration it takes from Warcraft 3 is very clear, but the twist here is that you can play co-op as a team of two.
The only thing to keep in mind before jumping into A Year Of Rain is that this is an Early Access and unfinished release. There's a lot of potential here, but you have to see it. There's still lots of room for improvement overall.