It was the best British bomber preceding the Lancaster. It carried a useful warload a useful distance at a useful altitude. It was rugged, but slow compared to German bombers of the time. The Wellington's defensive armament was comparable, possibly slightly superior, to the German bombers at that time.
It would be a very nice addition for EWA and scenarios as it is an early war British bomber that the early war German fighters can catch. Catching a smartly flown Boston Mk III in in a Bf109E-4 is probably harder than catching a smartly flown Mosquito Mk XVI with a Bf109K-4.