Though I haven't seen her do much outside of Nickelodeon she seems like a decent girl.
I barely remember her on Drake and Josh (hated the show so I didn't watch much), her character was heartless.
Ironically her character Carly on iCarly was very sweet. I really like iCarly, very good writing, and I'm not afraid to admit it.
I'm also not afraid to admit that she's a decent singer. Didn't even know she sung until some DJ mentioned her name on the radio after one of her songs played.