Yeah, I thought those characters were handled fine. Garrosh got a perfect send-off and Arthas was more of a cameo - his appearance was more about other characters reflecting on him.
I do hate that Sylvanas had the last word on Arthas though. Uther, the Obi-Wan to Arthas’s Anakin, just stood by and watched while Mara Jade delivered some completely out-of-touch monologue about us needing to forget Wrath of the Lich King. #Danuserisahack, #TheSnoozer, #YouGotJustDanoozed.