Brain Burst is incredibly useful for things like Crushers, Bulwarks, Maulers, Ragers, Reapers, etc...They're good at taking out big beefy elites rather than specials. Brain Burst will usually kill them while the rest of the melee is wailing on them. In situations where there's just too much shit to going on to focus on the Super Heavies, Brain Burst really shines because you can just kite them while they die.
That said, Brain Burst is good for Bombers, since if you tag them, they run off and get squished. The Special killer really does seem to be Veterans. But you have to work for it, unlike Kerillian's Career skill.
Got the Recon Lasgun, and I'm really enjoying it. It doesn't do a ton of damage per shot and has no stopping power, but it throws out rounds so fast that when you're getting headshots guys just liquefy. It's also really accurate from the hip, and dead accurate even at high range when aiming down sights. The standard Lasgun still has better time to kill a single target, especially elite and up, but the recon is just a good all around versatile weapon and feels good to use.
Also got the Power Sword, and I'm kinda in love. It has the same attack pattern as the Catachan sword. But the weapon special makes it go through armor like butter, and has unlimited cleave while active, it feels like. If you just need to flail against the horde to clear guys out it's good, and if you really want to slay horde and/or armored, it's good too. Pretty much invalidates the other sword IMO. I think it'll end up being my preferred melee weapon for Veteran. The knife, axe, chainsword, shovel and chain axe don't really do it for me.
Still looking forward to seeing the Boltgun, Plasma Gun, Flamer and maybe? Melta Gun. I'm finding I like DT's guns the same way I liked VT2's melee weapons. And vicea versa. I was never too wild on VT2's missile weapons, and many of DT's veteran melee weapons kind of underwhelm me.
Also, protip on Maulers: only their head is carapace armor. When facing them if you just unload all your shots into their torso, melee or ranged, they go down much faster.
Looking forward next week to when they add more missions, and probably functional content updates like the Barber coming online.