Pros: The cabin crew were inattentive. Call buttons went unanswered or were deliberately left. The service was basic. The crew allowed economy class passengers to continuously use our business passengers toilets and spaces, frequenting my space which was an annoyance. The toilet I used were a total wreck with cabinet panel doors left open. On a second visit it was all too apparent that someone had urinated all over the commode and the open panel door. Ridiculous is an understatement ! Not enough due courtesy or cooperation was extended to us the business class passengers when we were trying to stow away our hand luggage. To serve a plate of open mixed nuts then take off is a nonsense as I saw how those plates slid off and caused messes on passengers within my view. The business class seating did not recline enough. The entertainment on offer was totally substandard for the well travelled international passenger whom is woed by other carriers. On my return trip there was no entertainment at all on offer, very strange. Biman is a joke !!! The very dated aircraft interior left everything to be desired. I have deliberately kept many snapshots as evidence. Business class passengers pay that extra for a reason. The whole compliment of passengers for the entite plane were boarded and unboarded through our cabin areas, totally unacceptable and unjustified. The time I tried to purchase two on board duty free items, surprise surprise, yet again was told some nonsense and it was yet again another negative an experience. So overall, I will endeavour never ever to make the mistake of flying with any such substandard an airline whom a-z seem to be either be guided by or employ "clowns" whom are not in touch with the realities and ongoing standards being maintained by other carriers.