score:4
Upasaka Swapnil, interested,
It's a still practiced way in the high cold mountains, with also practical aspects, since such as fire-wood for burning is raw and soil might be frozen. Next to that it serves good for Asubha-meditation for yogies and monks.
Nothing generally wrong with such and not inhuman but not beloved by those attached to body as the Self and Subha.
Good to watch for everyone to get more detached to rupa: Sky Burial: Tibetan Burial Ritual (video on YouTube)
(Note that it has not been given for trade, exchange, stacks or entertainment but to use it skillful as means out of this wheel)