So, I didn't watch the Town Hall, but I heard snippets from Pookibur talking about it on his stream.
Tychus was the second/third hero I ever bought. My general opinion is simple. If you go with an auto-attack build, until you get a certain talent at level 16 (Lock and Load) you will have less effect on a fight than another auto-attack ranged Assassin. Stim Pack (level 13) + Searing Attacks may work too but I haven't given them much of a shot myself. You use the auto-attack build for solo merc'ing (especially with Vampiric Assault and perhaps Regenerative Master if you buddy up with someone to push a lane up until level 4). That's what gives you enough health regen so that you don't have to move as much between Overkill casts. It also let's you tank tower damage around level 10 if you get enough stacks. You absolutely have to take the Overkill and Grenade talents if you plan on killing people early or and/or roaming with your team. Trying to knock enemies you're chasing back into your team without Quarterback is miserable. And Lead Rain is probably his #1 best talent at all tiers and for all builds.
But you can also see how bad of a state I think Tychus is in if I find using Regenerative Master not a terrible choice for him if you go for an auto-attack-to-kill-mercenaries build. That said, I also want for Regenerative Master to not be a terrible trait in comparison to most other level 1 talent choices.
As an aside, I also wish Tychus had a Momentum trait.
Tychus was the second/third hero I ever bought. My general opinion is simple. If you go with an auto-attack build, until you get a certain talent at level 16 (Lock and Load) you will have less effect on a fight than another auto-attack ranged Assassin. Stim Pack (level 13) + Searing Attacks may work too but I haven't given them much of a shot myself. You use the auto-attack build for solo merc'ing (especially with Vampiric Assault and perhaps Regenerative Master if you buddy up with someone to push a lane up until level 4). That's what gives you enough health regen so that you don't have to move as much between Overkill casts. It also let's you tank tower damage around level 10 if you get enough stacks. You absolutely have to take the Overkill and Grenade talents if you plan on killing people early or and/or roaming with your team. Trying to knock enemies you're chasing back into your team without Quarterback is miserable. And Lead Rain is probably his #1 best talent at all tiers and for all builds.
But you can also see how bad of a state I think Tychus is in if I find using Regenerative Master not a terrible choice for him if you go for an auto-attack-to-kill-mercenaries build. That said, I also want for Regenerative Master to not be a terrible trait in comparison to most other level 1 talent choices.
As an aside, I also wish Tychus had a Momentum trait.