I had a decent length session on Evolve last weekend and have to say I was quite impressed.
It looks very nice, controls well, feels very polished overall and seemed pretty much lag-free and bug-free (Xbox One).
The asymmetric gameplay was what intrigued me, and it totally delivered on that promise. Playing the monster feels distinct from playing a hunter in terms of viewpoint (3rd vs. 1st person), controls, abilities and navigation (monster has free reign, can climb walls, jump chasms, etc. whereas hunters are corralled by the environment, and the maps are designed to provide that advantage to the monster).
The dynamics of a match are far more nuanced than your average competitive shooter too. You don't just run at each other from opposite sides of the map and shoot until one team lands more bullets and wins.
The monster needs to evade the hunters until it can hunt down and eat enough wildlife to evolve. The more levels you evolve the better chance you have of taking the hunters, so the hunters need to properly use hunting techniques like scent tracking, listening to the monster crash about, spotting flocks of birds fleeing the monster, etc.
The wildlife that the monster snacks on attacks the hunters. Shooting it can give away your position.
When the two sides eventually meet, the hunters need to use traps to keep the monster contained in an area, they need to use heals and shields, they need to use harpoon traps to slow the monster (manoeuvrability is the key to survival, not raw firepower) and this has to be co-ordinated.
It all works brilliantly IMO, but it does require teamwork and communication on the hunter team. A huge plus for gaming communities, but a big turn-off I would imaging for fans of lone wolf shooting. I can't see it appealing much to the average CoD fan (not being derogatory, I've enjoyed plenty of CoD in the past) due to the slower paced lead-up to the monster/team face-off and subsequent chase/tracking should the monster flee mid-battle.
It's not really a game for me as I can't plan regular sessions with a team. I have to snatch gaming time when I can. For those with a regular online friends list I think it would be a supremely tactical game, once you thoroughly learn each of the roles abilities.
The class tutorials seemed really good, and were actually a lot of fun on their own.
I read somewhere that there will be a campaign. If that's true I'd probably pick it up for that as the gameplay is really solid.