DLF's promised amenities are never fully delivered?

Kids have moved out, so this big house in Punjabi Bagh feels too much. We're looking at a 2BHK or compact 3BHK around Vasant Kunj or Saket, something manageable. Budget is around ₹2.5-3Cr. I'm trying to compare builders like DLF, Godrej Properties, and Tata Housing. How's their construction quality really after a few years? Do they deliver on promised amenities, or is it just marketing? Also, what are the post-possession maintenance charges like for projects from Birla Estate or Omaxe? Don't want any surprises there after selling our current place.