The only dept. store mascara I've used was DiorShow. I was mixed about it... the formula was pretty good, I liked how it made my lashes look. But I hated the smell of the stuff, and the brush was big to the point of being unwieldy!
Fav drugstore ones are: Physician's Formula Lash in a Tube. GREAT mascara, very buildable, gives lots of volume and length. I was really surprised no one else had mentioned it!
Also really like L'Oreal Lash Out, and Voluminous, although I haven't bought it in a long time.
For ones I haate though.. Maybelline Great Lash - too wet and it did basically nothing except... make my lashes darker. And wet. No lengthening, thickening, or curling at all. Kind of straightened them actually. And I also really did not like Maybelline Sky High Curves.... very, very dry (opposite of Great Lash!) I had to put about 5 (no joke) coats on before I could see anything, and it was so flaky. And no curling either...