Dhanishta Nakshatra is having some speciality because of its deity which can provide more results at a higher pace than compared to other Nakshatras. The Deity of Dhanistha is Eight Vasus or the deity which is representing all the abundance in this material world.
Dhanistha Nakshatra is spread equally across Capricorn and Aquarius constellations and here Venus is generally providing positive results. So Venus in Dhanishta will definitely bring luxury and pleasure to the native. But Mars is the Nakshatra lord of Dhanishta and Mars here is ruling this nakshatra in an unfriendly constellation. Mars is a planet which is against a normal marriage harmony and so occasional troubles and suffocation may be present.
Another reason is the lordship of Capricorn and Aquarius. Saturn is the lord of Capricorn and Aquarius. Even though Saturn is not a planet which stands against matrimonial bliss, it can bring a certain level of uncertainty and hurdles in married life. But always remember about the ways of Saturn… The Planet which is known as the great teacher always gives us troubles and hurdles in order to see the right thing and if we succeed in the tests, Saturn always rewards us in the most appropriate ways.
Now coming to the question about Planet Venus in Dhanistha… Venus is the spouse (Wife), luxury, Arts, pleasure, entertainment etc. Capricorn and Aquarius are Venus’s friendly signs and Dhanishta which is known for its abundance are off-course Venus’s favourite Nakshatra. A man with such a Venus in the birth chart, it takes care of his wife with love, affection and respect will definitely get the boon and positive results of Venus and if his wife is mistreated, then all the negative results of Venus will be easily felt as Mars who is the Nakshatra lord is best known for its fury and rapid actions
So in a nutshell, a combination of Venus-Mars - Saturn along with Dhanishta is capable to give you both very good and very bad results and it all depends on how you approach your married life and how you treat and regard your spouse.