I suppose we'll have to agree to disagree. I don't really think some boredom is reason enough to actively hate a character. I don't hate Kallen. But then I don't actively hate most characters; really Nina is the only one I simply despise. I also really loved the Ashford stuff and wish they took some time out of the boring-ass Chinese Federation/Xing Sue/Tianzi storyline to focus on Ashford. Again, YMMV. Also, even if you consider anything not Rebellion-related to be a waste, Shirley's screen time is not entirely wasted, considering that if it wasn't for Shirley Lelouch would never have gone to the Geass cult, and thus never would have fought VV and entered the World of C as his soldiers reluctantly killed child soldiers. CC would never have lost her memories, Charles wouldn't have killed VV and started on his Ragnarok Junction plan...seriously, Lelouch had no motivation to utterly destroy the Geass cult until he blamed them for Shirley's death.
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Also, even if you consider anything not Rebellion-related to be a waste, Shirley's screen time is not entirely wasted, considering that if it wasn't for Shirley Lelouch would never have gone to the Geass cult, and thus never would have fought VV and entered the World of C as his soldiers reluctantly killed child soldiers. CC would never have lost her memories, Charles wouldn't have killed VV and started on his Ragnarok Junction plan...seriously, Lelouch had no motivation to utterly destroy the Geass cult until he blamed them for Shirley's death.