I tend to feel the same way you do. You always want that guy that your team drafted to be the one that stands out among all the others and says "I took the fair deal and as for the big money, that'll come in time with me showing them what I can do....earning it if you will"
but that will not happen today.
We need to realize this is still just a kid for the most part. Let's say you are Donte. You get an agent and this agent is like the most hard headed evil car salesman or attourney you'd ever want to meet. He is not negotiating for you only, he is negotiating for his cut as well, and for the sake of future prospects seeing what he did for you, his current clients, and so on.
The agent is throwing unimaginable amount of legal forms, terms, and figures at you. You are anxious to snatch up the first offer the Bills throw up, because quite frankly even the league min is probably more money than you ever thought you'd see in your young life.
Couple this with all the time you've invested in this agent and all the while he has been your number one source of information concerning business and the future of your life.
Remember, these are young dudes and even if he feels every night "I wish I never hired that heartless son of a b*tch as my agent!" he knows he's in too deep and his hands are now basically tied. They probably had him agree to some terms in thier own contract that states he will let them make the call on certain aspects of any proposed team contract.
I'm not defending these guys, but there's a lot of stuff that goes on behind the scenes that the fan never sees. It is just my take that the above is kind of what it's like.