Hearthstone Arena Drafting!

[Fleeing Coward]

Shield block is not consistently bad. it's very consistently mediocre. And after some time, you learn to appreciate consistency over potential

The fact that you can't play it as a 3 drop because of all the tempo you'd lose makes it bad. Until you hit 9-10 mana, the cost is a huge drawback as you're greatly restricted in what you can do on the turn you played it while having no impact on the actual board. This isn't constructed where you can design your whole deck to make it work. The only thing that stops me from calling it horrible is that it at cycles so you at least don't lose card advantage playing it.
Blackwing Tech had the potential to be great and even as a 2/4, it still trades with or outright kills most other 2/3 drops which is all you should ask for out of a 3 drop.