@mitran: Wasn't bad writing at all, Thanos is straight up classes above BB. Sure BB is a threat and i'm not denying he's a powerhouse, but no way is Blackagar Boltagon a universal threat. Thanos on the other hand, is a universally feared being. So give credit where credit's due... BB put up a good fight, but it was a loosing battle from the start anyway.
Thanos isn't a universally feared being due to his own personal power. He is a universal threat - or can be - because he tends to exploit prep/the latest cosmic MacGuffin and, if one was to be a tad unkind, one might say it was also because cosmic beings tend to be written somewhat idiotically in his presence. BB's voice OTOH was pretty serious business but its lost a bit of its mystique in recent years.
Like its any different for say Hulk to win battle even though the majority of writing he wins not on cunning or brains but just strength not an impressive power which in of itself is not that impressive.