The numbers speak for themselves.
I can't sit here and say she doesn't have talent, but at the same time she has been slacking in both aspects of her careers. She doesn't give it her whole. She has not given her music career her whole especially when it comes to writing, promoting, dancing or choosing the right tracks. And she has not brought her A-game to her film career. It seems like she always does something half-assed.
If we talk numbers, "Love?" was a flop. Again, I'm not trying to drag her, but I want to have a conversation where we are keeping it real. She created an album full of leaks, crap, fillers and full of auto-tune, and clearly nobody used. "On The Floor" did amazing I give her that, but it took her how long to have the best-selling of her career? For me that is good and bad, depending on how one takes it. Promo was extremely bad as well. "Goin In" I predicted was a mess from the start, and look where it ended up. And "Dance Again: The Hits" has done less than stellar.
Going over to her other career, "The Backup Plan" was supposed to do great and be her comeback to the silver scren, but instead debuted @ #2 and did moderately well overall, same goes for the films that followed after. Again, "Ice Age" becomes I believe the best grossing film she's done in her career. Good or bad? Depends on how you see it.