I love Bartoli (for more reasons than I'm prepared to go into right now). So consider me a Bartoli partisan.
Does she have limitations? perhaps, I'm not expert enough (thank God) to know; She sounds sweet to my ears.
My current Bartoli favorites: St. Petersburg, Arie Antiche and the DVD of Paisiello's 'Nina, o sia La pazza per amore' (With the added bonus of Jonas Kaufmann accompanied by bagpipes!!). Bartoli has certainly found a home in the eighteeth century - which is fine by me, it's where I live most of the time anyway.
This is for Bartoli fans. The rest of you can go jump in the lake.