What is the quality of the graphic design agency? what do you look for choosing a good graphic design agency?
They are like graphic designers themselves. There are fast ones, good ones, and cheap ones. There are even fast-and-good ones, fast-and-cheap ones, good-and-cheap ones. That’s it. The choice is yours.
Why are you asking graphic designers what they look for when hiring design agencies? We are those agencies — we don’t typically hire them ourselves. Are you, instead, asking what we think our clients are looking for when hiring us. If I’ve misunderstood your question, perhaps you could rephrase it.
I will say this, though. If I were a client looking for a design firm to hire, I’d likely not hire the firm that responded to my inquiries with a confusingly worded reply.