Sure the Brits got some benefits for colonization, but in return they gave the fruits of a system that was 1500 years in the building (if you go back to the Anglo-Saxon moots that were the foundation of the British system). British colonies got the English legal and political system (which is pretty darned good, and forms the basis for ours - with variations) and the English religious/moral code (which isn't bad either).
Back when I spent a good deal of time in the Caribbean, the rule of thumb was that you could count on decent water, good roads, reasonably honest law enforcement, and an Anglican church wherever the Brits had been in charge.
And you can't compare the British Empire to some idealized concept of political perfection in your head. Compare it instead to its contemporaries: the brutal empires of Belgium and Germany, and the less brutal but wasteful & ineffective one of France (I once spent an hour trying to deal with a couple of Parisian customs officials who had been imported to St. Barthelemy. Even the locals hated their guts.)
What's really sad is that Britain seems to have given it all up with hardly a whimper.
Alright, but besides the legal and political system and religious/moral code, and the industries what have the Brits ever done for us?