These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The Scrappy: Stu has no redeeming qualities whatsoever.
They Wasted a Perfectly Good Plot: Film Brain also mentions that if the movie ended with Charlie setting-up Cam with Howard, the renowned penguin expert whom she admires, thus having her find her true love. This would be a very Bittersweet Ending, which in his opinion, makes up for a lot of Charlie's previous behavior.
Why Would Anyone Take Him Back?: Cam broke up with Charlie because he was being a creepily possessive Jerk Ass. He never tries to explain himself (about the curse) - neither when she breaks it off nor when he begs her forgiveness at the end.
Not to mention that he whored himself out before, and she still took him back.