The dragon was not a problem in this episode. If anything, the tv show dragons are underpowered. Book dragons can't be killed by 'scorpions' unless it's a one in a million shot through the eye.
Dany and Drogon figured out the scorpion arrows and destroyed them. What on god else was going to stop Drogon after that? If drogon struggled with the arrows then people would've complained about that too.
See your point but disagree.
Just all way too easy, and the constant destruction got boring real quick.