Thoughts on Unit Options
Scum has a good variety of options, but they all typically lean towards the glass cannon approach, with high damage but typically low health (I'll say the Bantha counts here, because defense dice are essentially a health multiplier). The options Scum has for front line troopers are Wing Guard or Trando Hunters, neither of which are really good enough to fully suit the role.
Basically any Scum list you're going to see right now is a selection from the best units Scum has to offer, with filler for the rest, hoping the good can balance out the weaker units. This seems to be the approach FFG has taken for balancing Scum, by introducing several very powerful options without really buffing the other options.
Combating the Meta
The current meta is that of elite Troopers, with good health and damage output, though typically lower numbers. Often backed by support options, be it Blaise with his command card shenanigans or Gideon+C-3PO for focus.
Scum's best options for defeating this is really the same as what I mentioned earlier on how to approach list building: take HKs, Bossk, and the Bantha and hope you can break the Troopers before they break you. The biggest problem to this approach is that all three are glass cannons (Bossk less so, but still susceptible to being killed quickly). If you allow the Troopers to engage you before you can kill two or three, you will lose. The HKs will evaporate and the Bantha will melt, leaving Bossk as the single target of firepower. The rest of the list will not be able to pull through and defeat the Troopers.
The approach I'd suggest is to fill out your list with something annoying to kill, then send those in first, with HKs, Bossk, and Bantha free to attack the distracted or already activated Troopers. Make sure to wipe groups when you can. Killing Blaise is a good idea, so you can start hiding your command cards again.
That's what I see in Scum. I feel it has several good options, but lacks good choices to fill several roles in the faction. I'm looking forward to Jabba's Realm, which looks like it's going to fill several of those holes.
What do you think? Agree with me? Think I'm off my rocker? Feel free to leave a comment letting me know. As much as I'd like to be, I'm unfortunately not the end-all-be-all when it comes to Imperial Assault knowledge... yet.