They have managed to be competitive in 3 games straight against top teir teams winning 2 of them as well in a big tournament. That's a first for them. They have also provided a player good enough to be the #1 test all rounder and beat New Zealand 4-0 just about a year and a half ago.
So pretty good signs there but some would say that its about time some improvements came after a decade of having test status. Sri Lanka also shock of their minnow status about 20 years ago in the early 90's after a decade of being minnows of cricket. Can Bangladesh do the same?