We have visited veg nation main branch (anna flyover) many times and Adyar branch ones. Only the main branch seemed to be well equipped. Adyar branch didnt even have most of the items in menu.
We really love their starters, few of our favorites are,
Barwan paneer tikka,
Corn nuggets,
Mushroom fantasy,
Crispy fried vegetables,
Bhindi Jodhpuri etc
Their sizzling brownie with ice cream is the best when it comes to desserts.
Main course we have tried north Indian delicacies and few south Indian delicacies. They were all equally good. We never opted for their Buffet and always preferred ala carte.
Would highly recommend this place for vegetarians.