Being extremely open-minded and a minimalist, I don't care whether it's high or low-end, because I don't worry about amount of pigment and such. Don't hate me for my low-end choices.
Explanation below.
Favorites:
MAC
Estee Lauder (fragrances, various cosmetics, eyeshadows, lipsticks - especially Sugar Honey & Sangria)
Lancome (Juicy Tubes, Miracle fragrance, and more)
BeneFit (I love Dandelion and Georgia - don't know how I lived without them!)
Prescriptives (Magic Liquid Powder, and more)
Clinique (Gentle Glow Powder and a few lipsticks - Bamboo Pink especially)
Urban Decay
Sugar (Yummy glosses!)
Bobbi Brown
Merle Norman (Mocha lippie)
Avon
MeetMark (love Hollywood Pink, and their Tea Pot Glosses)
Physician's Formula (low-end, but I love them)
Jane
L'Oreal
Cover Girl (they make one of my fave eyeshadows - Bedazzled Biscotti, and also Meringue Blush. Can you tell I'm a minimalist?)
Revlon (Skinlights line)
Almay (grew up with it)
I'm probably forgetting a few more...I'll try almost anything. Not had too many bad experiences.
Least Fave:
Well, being a little too poor at the moment to buy most high-end right now, and never having had bad experience with many low-end, I can't say very much. Of course, I don't care personally about how one high-end has more pigment than a low-end. I've never been into much pigment in colors. I like to look natural, and 90% of the time (since I'm at home) I don't even wear makeup. I use a little powder just to even my skintone, because my skin is already clear, and a neutral eyeshadow and highlighter, maybe a little blush, and lipgloss.