I played this in a Dexter deck and took it later in the Scarlet Keys campaign. By that point, half the bag is symbols, even without any of us using blessings or curses, and in 3-player this triggered almost every single turn. Dexter cares a lot about continual economy and this card was a life saver.
So this card is just worse than Overpower or Manual Dexterity (depending on if you're using Fist or Foot for your ranged assets).
What's the problem? Primarily it lies in the narrow use case for this card: 'Use it on a skill test from an ability printed on a Firearm or Ranged asset". Taking Fist as the obvious example, here are four things you can't commit it to that Overpower could:
Surely then Crack Shot is strictly better than Overpower on a firearm attack? Well, an extra +1 to the skill test is nice and necessary especially at higher difficulties. But Overpower makes up for it by letting you draw a card if you succeed. While I can't objectively say one is better than the other- though usually I'd prefer the card draw, even in it's one niche case Crack Shot is contentious.
To summarize, the extra skill icon is not worth the restrictions this card places.
Based on the wording of other cards with multiple conditionals, eg Rite of Seeking, the push on Bum Rush appears to be unrelated to if you succeeded the evasion attempt.
That would mean Bum Rush can be used to "permanently" deal with non-hunter non-elite enemies, preferably also non-alert.
Edit: Does not not work with Forced Learning as that card is discard out of your turn :(
Edit: Checking the rules if skill cards committed to a test are discarded afterwards from your hand. If so, Lawrence may still be good in a high skill deck.
With drowned city. Big question about interaction with the library card asset. Can the tome be attached to both at the same time or does abigail make all tomes 1 cost fast actions together. 9xp for tomes to be fast and cheaper (if you draw abigail) is pretty solid.