Looks like a lot of you have been here for a while, as someone who only got the alpha last night here’s my initial thoughts, for what they’re worth.
Gun play
I tend to judge games initially by some vague concept of how it feels to just move around the map shooting people. If the “shooting” aspect of a first-person-shooter doesn’t work for me, then the game as a whole isn’t going to regardless of whatever other goodies it contains.
I’m pleased to say the basic shooting mechanics seem pretty good, although I only played Engineer, with whatever gun the Engie gets.
Personally I’d prefer more damage, or a higher ROF, but I suspect I’d be going against the flow on that one, as most of you lot are probably ex-ET. Accuracy seemed good, but I found full auto from the hip was a bit too good, as in too good to bother with anything else. Again, I can hear the ET players gearing up to have a go at me, but if you can crouch / burst fire / iron-sight then there should be some reward for doing so. I suspect there is, but it’s so slight as to be hardly noticeable.
I’d particularly like burst firing to be positively rewarded. In RTCW / ET the guns had an expanding cone of fire, whereby the spread would increase (from practically nothing up to a maximum value) the longer you held your finger down on the fire button. It would then decrease (though not immediately) when you released the fire button. By tapping the fire button you could maintain a decency level of accuracy. I don’t know if that’s the case in DB, but it seemed to me that burst fire gave little additional benefit over just jamming your finger down on the fire button.
Movement
Movement feels OK, a lot better than Brink, but that’s not saying much tbh. I felt movement speed was OK, but I’d like some kind of strafe-jumping. I saw a few people bunny hopping (not the same thing) but there seemed little benefit in doing that either. I’d love a new game to play where some movement mechanics were specifically provided that made getting from A to B a skill to be learned in itself. Not sure if falling damage is a little too high, jumping off a car roof or a 6ft high wall seems to result in damage?
Game play
Pretty hard to argue with a map that feels so much like Goldrush! For competitive play however I’d suggest the EV is too slow. The first thing the ET comp scene did was increase the Tank movement speed by 50% on Goldrush (and Fueldump when it was still played). Not sure if it was ETPro that enabled this, or if it was a standard ET cvar, but the EV could do with being a bit quicker IMO.
I’d like to reserve judgment on map balance until a few 5-v-5 / 6-v-6 scrims have been played, but this Echo system you’re using seems like a great way to figure out where the bottlenecks are and smooth out the objectives.
Other stuff
I felt my FPS was a bit jumpy, I felt a certain amount of input lag at times, I spent a bit of time adjusting mouse sensitivity but it still felt a little “off”, but this could be more to do with the fact it’s an alpha. I need more game time to get a better feel for it. Overall the game looks very promising indeed. 
