I agree with that as well. For all the praise the game gets, I never understood why people are so blown away with Hyrule Field, and the business of Castle Market.
I know the Field was impressive to see just how large Hyrule Field was, but really, there's not much going on in it. No major areas with trees, no real landmaarks other than Lon Lon Ranch, and everything is stuck to the borders of it. It survers a purpose as a hub to other areas, but it could have been better filled. TP really took this idea and refined it. I felt like TP was something worth exploring. Hyrule Field bored me after a few treks across it.
With the Market, the main part was definitely busy with many people to speak to, but I was expecting to be able to enter every second building and have different shops and such. This disappointed as well, and was again, something TP greatly improved upon.
Regardless, OoT's a fantastic game, and these minor disliked really don't take away from the entire experience. I might have found these more disappointing after playing TP, but at the time they were new, they were minor issues.