My dh used to be in new construction (superintendent). He said the biggest complaints were the initial extra costs of buying a brand new home.
Usually landscaping in the back isn't included, so no deck, grass/rock, trees, etc.
Inside, no window coverings. When you buy a resale, the curtains/blinds usually come with it. Even if you hate them, you don't have put sheets up over the windows right away.
Basements aren't finished either (if applicable).
Otherwise, new construction is nice because you're the first to live there. No weird stains, etc.
If you're looking at a specific builder, feel free to PM me. I'll ask dh about the company's reputation for you.