Well I don't Bangladesh are a good team in T20Is.
In this format, we can compete well against lesser sides like SL and Pakistan, both historically world class T20 sides but going through transition and form slump respectively, and bit of both too. We haven't figured out how to play this format and to add we don't have the muscle power to do well here.
Its a shame really, that we haven't done well in this format given how it was considered most suited to our brainless cricket back in 07 but now our boys have matured but we are missing out of muscle strength and athletism. However, India was in similar conditions between 09 and 12 where they failed miserably in T20Is despite such world class cricketers. Bangladesh is facing the same scenario. Our focus is on FC cricket right now, and with a few more BPL editions, some extra focus on fielding, and influx of foreign coaching, we can only get better and better in this format.
India only recently have started reaping the benefits of IPL, with fielding improved and some decent lower order batsman like Hardik, the rest like Jadeja are substandard though but this HP guy is a pure clean hitter of the ball and not a blind slogger. If anything, Bangladesh are more similar to India than any other counterparts and by the looks of it we are heading the same way as Indian cricket with the exception of the having a better pace attack than spin attack.
No doubt India are far better than us in T20Is, but having the added advantage of experience. BD lack that experience and only got ourselves to blame. If BPL didn't have any issue and BCB was able to host it in 2013 and 2014 we would have been far better off in this format. Barring BPL we don't have any domestic T20 competition but there has been a lot of improvements.
However, Bangladesh are still waiting for their first Truly world class, all terrain batsman like Smith, Kohli, Willlamson, Root, who would bat at no. 3 and win us matches. That one quality player is the difference between being a quality side and an ordinary side which we currently are. We may have all the facilities in the world and all the fans, but we need find a matured batsman.
The hopes are pinned on someone like Shanto and Miraz, U-19 players who have shown tremendous promise.