Akhtar himself was not very tall.
I am not dragging race or whatever into it.
Just the fact that Bangladeshis do not have power hitters.
You could easily see that boundaries can be cleared in this batting friendly wicket if you have power hitters when Mashrafe hit a few relatively big sixes. Most Bangladeshi players are lean and thin, and have not much strength. Even Zimbabwean players are bigger, and that's probably why Afghanistan is able to defeat Zimbabwe but Bangladesh find it hard in T20s.
Pakistan is in the same league as Bangladesh, Zimbabwe and Windies now, at least in T20s, with its atrocious batting (lack of) firepower.
I put the Windies the first of the pack (of these 4 back-benchers).