Yes he did bad things, but if it wasn't for Frostmourn he wouldn't have done the things that everyone thinks are unforgivable.
As for stratholme, what was he supposed to do?
When I was reading the novel "Rise of the Lich King", I didn't feel that he was full in control after taking the blade, he was changed, the blade changed him to the core, so regardless if he had free will or not, he wasn't the same.
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He kinda was.
In wrath we were told by Uthur ghost that the only thing keeping the Lich King from kill all life is the renaming part of Arthas, so in a way Arthas had no control.
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Oh yeah .. I did, that's why I am asking this question
I kinda wish they stuck with the old story, it would have ended his story with his death, but the new story opens the door for more speculations.
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In the original story he was under the influence of Ner'zhul as a death knight, then when he merged with him, Arthas as an independent character ceased to exist.
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This +1 ...
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Nah .. he did not.
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Anduin knew everything before being turned, Arthas thought the blade will grant him power to save his people.