Okay, so, final impressions.
Playing with Titans reminds me of playing Halo. I like Halo. When I start a match I'm usually around 1:1.5 k/d ratio against pilots. Then I get a Titan and it jumps to 3:1. People who like to leave their Titans on auto because they prefer to be on foot get eaten alive by me. Titans just have more ways to counter Pilots than Pilots can counter Titans.
I like the parkour. I'm not very good at it. And it's not safe to practice. So I'm doing less parkour beyond taking out high ground campers and short speed boosts.
The Smart Pistol in this game will be like the Pyro in TF2. Popping your own grenades will be like airblast juggling into flare/axe crits. I wish I tested if you can get a grenade reload more than once with the same Titan.
Killing pilots is always worth more. Always. Three or four pilot kills equals a Titan, while it takes more than six Grunts/Specters just to be worth the same amount in time. Attrition is an interesting mode because it'll be the only mode where Grunts/Specters are really worth something. Killing only pilots doesn't work unless you can kill them with almost zero downtime.
The Chaingun on the Titan without mods was the best Titan weapon in beta. Runner-up is either the 40mm Cannon without mods or the Rockets with the single fire mod.
In Last Titan Standing, you learn that you need both the Vortex and the Smoke. Vortex great for pushing, Smoke great for ambushes. The fewer Titans around, the more useful Smoke is since it blocks both Pilot and Titan lock ons. Vortex is a shield first and a counter second, so it's easy to get overwhelmed if you're hit from multiple angles but it's great in a chokepoint. When the full game comes out and I can use a Stryder with impunity I'm going to love using the smoke and then triple dashing behind a guy.