The map is a campaign map conversion which make the terrain very Blizzard stylish. It however is not acceptable for a melee terrain at its current state:
Player 3 has no place to build on and Player 4 suffers from it too. Only Player 2 has enough place to build on. You might want to fix those roads to turn then buildable ground and fix some doodads off the way, or think some other creative way.
The Neutral building placement is also unfair: Fountain of health is unreachable by Player 2 and 3 for example. Try to mirror the map somehow to make it more balanced. The map seems a bit too small for 4 players (no room for additional gold mines).
Some creeps are facing really odd angles. The item drops are just pure madness. Currently even an easy creep can drop you a Kelen's Dagger of Escape. Make it more realistic: easy creeps drop low tier items and ramp it up as the difficulty of the creeps increases. Also, prefer making the item drops more stable, instead of picking one item out of 25 possible random items that are not even on the same level. Some creep camps (such as the 4 granite golem camp) is also too hard to be efficient - players lose more than they can gain from it. Not to mention that each player does not have the same creep camps: Player 1 and 2 have an easy gnoll camp but that is absent in Player 3 and 4's side of the map. Some creep camps are also too close to the roads and thus should be moved farther to avoid unintentional interruption.
At the current state it is not acceptable.