I was just looking through the different cards by class (Strength, Instinct, Covert, Tech, Ranged) to see if there are any patterns, and here is what I've seen so far:
Strength, Ranged, and Covert all have similar amounts of economy cards.
Instinct and Tech have almost no economy.
Everyone has similar levels of attack, there is some variation of course, but it is all in a similar ballpark.
Instinct is the big winner here, followed by Tech and Ranged, with Covert and Strength bringing up the rear.
Only tech and Covert do this, and they seem to do it similarly well.
Covert is the most splashable class, followed by everyone but Tech. Tech is the least splashable due to reliance on symbols.
Overall I would say the following are class strengths:
Covert: Rescue Bystanders, Splashable
Tech: Draw, Rescue Bystanders
but are you implying that maybe if you want draw cards and there is a instinct hero that draws and a tech hero that draws, you should get the instinct one?