I like Iggy and don't think she's a bad rapper at all, it's just that her production is god-awful. Hopefully she'll have a bigger budget and be able to work with better producers on her next album.
"0 to 100" is a "Starting from the Bottom" carbon copy. At least when Eminem rehashed his lead singles ("Real Slim Shady" --> "Without Me") the songs were a lot catchier and smashed harder.