For example, I'll start this list by saying that I've heard that the ledges in Incineration Zone gives Terrans the advantage on this map against both Protoss and Zerg since it gives a bit more advantage to Reapers and Siege Tanks.
I don't know the reasoning behind it, but I've heard Day9 mention that Metalopolis is a very Zerg-favored map.
Terrans - Cliffs allow for good use of Siege Tanks and Reapers
Zerg - Can expand more easily?
Terran - Backdoor is actually worse for terran because they'll need to defend two entrances to hold 2 bases, which dramatically slows down their expansions and pushes.
Protoss - Stalkers Blinking through destructible rocks allows for more effective base raids.
I'm perfectly willing to admit that I probably don't have the best understanding of this game yet, so I'll edit the OP if enough (Just like 2-3+) people think the reasoning is flawed.
At the same time, I'd like a BIT of a consensus before more are added on. Like 2 other people agreeing with a reasoning.
Also, I'm not the best at finding/acquiring replays, so of course, replays being posted would be a HUGE plus.