Were dodo birds dumb?

I'm curious to know, were dodo birds really as dumb as they're often portrayed in popular culture? Was their extinction truly a result of their inability to evade predators or was it due to a combination of factors such as habitat destruction and human hunting? Did they possess any unique abilities or behaviors that may have been overlooked in the past? And, if we were to discover more about these fascinating creatures today, might we find that their reputation as being "dumb" was a bit of an unfair characterization?