OK, here's what I think:
[+]Many heroes, but too much common Blizzard's Heroes
[+]Exciting when all players are there
[+]First asymmetric Hero Arena
[+]Higher than average AI
[/]I know that terrains don't mean much in Hero Arenas, but just importing and changing Blizzard's map isn't there. Ace of terrain in this map is dome portal.
[-]Almost no events(just Lucifer spawning and portal), not counting duels
[-]Too much common Blizzard heroes
[-]No bases, only one fountain of Health?! Sorry, but that's lame. Bases with shops and fountains are main things that Hero Arena must have]
1. About the map terrain i simply made it from blizzard map and modified it a little bit cuz I like the campaign level (if you don't like the terrain blame Blizzard

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2. The many Blizzard Heroes are intentional after all this is a hero arena and as a fan of Blizzard charters I decided to make it like so...
3. The concept of a single base (peace zone) is exactly not to be like all other hero arenas
4. Could it be better... damn of course it could i have many ideas but little time so I do my best and if start to incorporate everything I think of in the map it would probably be like 10mb. or something.