Definitely Tragic
I thought King Lear was a prideful, but nonetheless respectful, character from the beginning of the play. Yes, he exiled his favorite daughter, but due to her own stubbornness and pride. Regardless, he recognized his degeneration due to age and relinquished his throne and entrusted his personal care to those he most trusted. The tragedy is that he was so poorly treated, his kingdom, and his entire family were destroyed. Of all of the plays we've read, I think this is most suitably called a tragedy.