I'd rather be middle class in a developed country now than any king 200 years ago. No amount of wealth could have gotten me modern medicine, especially anesthesia(!). Even stuff that's now trivial like pretty fresh tropical fruit or good food from other countries in general would have been very hard to come by. I have way more knowledge and entertainment at my finger tips than any medieval king could have ever dreamed of.
Most of the middle ages probably wasn't that bad, but the civilization-destroying plague destroyed civilization, and Renaissance-era propagandists exploited the living memory of the plague to make themselves look better.
In fairness, in those cases, when they romanticize the thieves, they usually try to make clear that they're only taking the bank/casino's owners and are careful not to hurt anyone.