Hm, this is hard. There's many options but I will say ARTPOP. The Fame is like 80% filler but at least it has Poker Face, her best song. ARTPOP is just dull, imo.
ARTPOP. She hyped it up like it was going to be a great album, and I liked the songs she did at the iTunes Festival, but for starters, she ended up rewriting a few of the songs, which was disappointing. And I didn't like the songs as much; there was nothing on it as good as her earlier work. It's still a decent album, but it's the one I listen to the least (except for Cheek to Cheek, but I like Cheek to Cheek a little better).