[RCF]

It's clear that Desai has emerged triumphant. Few poignant lessons:

• Persistence can overcome even the most formidable obstacles - even winning other person's wife
  
• Exploit others' vulnerabilities and fears; they will eventually succumb.
  
• By feeding people's desires, you can manipulate them into surrendering their dignity.
  
• By indulging their fancy, you can ensnare them in a web of their own creation.
  

True Desai's character has been a revelation but giving happy ending to Desai, is it morally correct?

Yes persistence will give you temporary win but with out true love it won't survive. Desai's love when compared to Krish is meek. Its proven in case of Nidhi when he lost a step where as despite many opportunities with Parvathi and Maithrei Krish did not take it. Desai manipulated Meera with his reasons but truth is he cheated on Meera. so how can he get Meera at the end. That's not a true ending.

All the points you mentioned belong to a person who is manipulative and shows he goes to any extent to achieve once he sets his mind but with out moral reasons behind it giving him win at the end will be lame.