I do not remember when Bangladesh lost so badly in their own venue. The Bangladesh team won the series against the India team. On the other hand, the last few series of England did not have good performances.
England had also won the ODI series against Bangladesh in 2016. It was a home series for Bangladesh. Now they have lost against England again in their home ground. Probably Bangladesh will be whitewashed in this series. The third match will be played in a different venue, the condition of the pitch is batting friendly there.
The pitch conditions will be made in favour of the home team. The same won't help everytime, depending upon the performance coming from the players scenario changes. As said it looks like a whitewash, and prior it played against India in home ground and won the series 2-1. In one of the match it was Mehidy Hasan to take the match towards win batting at the tail order scoring 100 runs. This time he failed scoring 7 runs in both the matches. Likewise each and every player have didn't contribute.
You are right in the series between Bangladesh and England, England is already 2-0 ahead in the match.Even they have already won the series as this series is of three matches.All Bangladeshi players are out of form in this series and nobody is giving their best for which they lost two matches against England.