Do you think Christina Aguilera has gotten better or worse over time?

I don't wanna use the word worse but the music she's put out is definitely not as sensational as say... Beautiful or Hurt.

Her voice is still the same greatness to me.

Personally, I think her voice gets stronger with every album.
We saw her true voice on Stripped, then even madami greatness on Back to Basics which btw in my opinion her voice was even madami powerful in. And I've heard the 18 tracks on Bionic, and I can honestly say I haven't noticed her voice declining..it just keeps getting better.

Bionic is epic <3! And 'You Nawawala Me' is one hell of a ballad!