Sohna projects: The real cost of hidden construction snags?

Since January I've been shortlisting flats in Sohna. Currently in a 2BHK, thinking of upgrading to a 3BHK or villa like Anant Raj The Estate Residences. For investors, how do common construction snags post-possession impact long-term maintenance and resale? Also, are the green areas truly open and usable, or just cramped spaces between towers? Need opinions on this.