Austen has such a way of using the third person limited point of view. This is especially noticeable in P&P - we see people and events through Elizabeth's eyes, and, as a result, likewise develop a prejudice against Mr. Darcy.

I think Austen is employing a similar technique here. It seems like the reader is made to see Edward through Marianne's eyes. Marianne is much more vocal about her opinions than Elinor is. So, our assessment of Edward may be a bit "tainted" by Marianne's opinions. It will be interesting to see if/how Austen will cause the readers to change our "first impressions".