I most definitely wouldn't call him "misunderstood": he explained himself very, very clearly.
But, technically, murdering criminals to save civilians is a classical antihero's MO. The Punisher does the same thing, and he is considered Marvel's archetipycal antihero.
The whole "beat the crap out of Tim in TT" is just bad, though. Especially because of the atrocious yellow leggings. Tainting the memory of the sexy old-school bare-legged Robin costume was unforgivable.