Wait a sec, will ya?
While it is good to keep an open mind about one's work -- i.e. to be willing to accept criticism and use it constructively -- please remember that (as far as I can see here) this particular feedback came from ONLY ONE AGENT.
In other words -- you shouldn't edit/revise based on only one person's idea of what's good writing (or not good writing). No matter how great an agent or editor, s/he is just one (expert), and somebody just as expert might have the exact opposite feeling about your writing.
If you see a consensus building from an assortment of agents -- i.e. several people note a particular problem -- well, that would be a good time to take a hard look at the writing and revise it.
But just one voice is enough to make you doubt yourself? Not good.
Unless, of course, if you really didn't put enough effort into making your writing the best you (thought you) could -- prior to sending it to that one agent. In that case, the single person's criticism could very well be valid and the revision overdue.
Just, please -- don't think that any one agent or editor is all-knowing, all-seeing, and worthy of sacrificing your singular voice or instincts to --
And GOOD LUCK!