Zimbabwe from her debut Test to right before the exodus (batting)
Bowling stats
Quite a solid batting average of 27.66 and a respectable bowling average of 37.76
Bangladesh in her last 15 Tests (batting)
Bowling stats
So our batting figures (26+ average) aren't that far behind Zimbabwe with the Flower brothers, Houghton, and Goodwin. But our bowling stats are significantly poorer with a 44 average helped in part by a series against a weakened Windies side.
Conclusion, Zimbabwe in her prime were considerably better than we are even in our last 15 Tests. And we haven't been all that bad.