It had a slightly better payload than the 4 engined Avro York, or the Lancaster for that sake, with 6 engines rather than 4. No miracle performance. The York could actually get to around 290+ mph!
It was a bulk of a glider, which proved slightly too heavy and was clapped into a powered aircraft. Very remarkable feat though.
And it had sad days during the evacuation of Tunisia for instance, as so many German transports (and other aircraft as well) which got pushed in there from many other places, - aircraft were even brought in from Stalingrad.
There is yet a lot to be found at the bottom of the med....