First impressions
Call of Duty-like. Definitely a run and gun shooter. Minimal reason to stand still. The addition of AI soldiers is okay, gives you something to do besides stalk enemy players and there's some strategy in efficiently killing them to help you get your titan faster. They're even less dangerous than creeps are in DOTA though. You can literally stand in the middle of a pack of them and barely take any damage.
The pilot (infantry) combat is meh. Like I said, feels similar to CoD. Parkour element is tough to utilize in combat and most people are using it just for movement. Accuracy of the standard assault rifle is good enough that you can basically hold down the trigger at close and medium range and whoever does it first wins. Long range combat requires some fire discipline. Health is pretty low, expect to die in a gunfight in 1.5 seconds or less. Melee is insta kill and comes out very quickly, making it a serious danger (about 1/3 of my pilot kills were melee kills without intentionally trying to setup any of them).
Titan combat is much more interesting, similar to old mobile mech games like Armored Core without jetpacks. Quick dash abilities in any direction and sprinting makes them surprisingly mobile. Unsurprisingly, they have super lethal weapons and can near instantly kill any infantry. However, your long range AT weapons can harass them, and being able to climb on their backs and shoot the internals destroys them very quickly.
Additionally, titans start with a power to "grab" fired enemy bullets and missiles (think Neo from Matrix) and toss it back at them. Interesting fight tactics happen between titans when they duel with bullets, missile and vortex shield. Battles are quick, mobile and lethal, which I like a lot more than Mechwarrior "stand there and blow each other up" gameplay. Think more Japanese mech inspired vs. Western (like Pacific Rim).