I like to have a little bit of everything in my case, so I'm willing to try different brands if the reviews/price is agreeable. There are just a few brands I keep at an arms length.
Drugstore:
UGH, Covergirl!!!!! I started using it when I was like 13, because at the time, it was the only drugstore brand that had a proper match to my skin. Then, a couple years ago they did away with my shade (Toasted Almond) in their regular foundation, and it was only available in the True Match stuff (which is garbage IMO). Their mascaras are crap, eye shadows are such poor quality, the ONLY product I purchase from them time and time again is the Ultimate Finish cream foundation in Classic Tan, I use it as like an all over concealer for my acne scars. I think they are phasing it out slowly because its getting harder and harder to find that shade.
Almay: I used to really like their liquid eyeliners but that's about it. They cater to the lighter skinned ladies, so I really just have no interest in their brand.
Physicians Formula: I have been using their bronzers for years, but their other products are a hot mess. Too much shimmer, not enough staying power.
I'm totally obsessed with Rimmels mascaras, love Miliani bronzers and shadow sets, Maybelline Fit Me is actually the first DS foundation since Toasted Almond that worked for me, ELF, NYX, and Revlon always have something for me!
High End:
I really like MAC, UD, MUFE, Too Faced, Lorac and some of the Sephora brand items. My mom worked at Lancome for about 15 years, so it was always around the house. The only thing I really like from them is Definicils, but I always had the sample sizes, I cant justify spending 30something on a full size tube that is going to get thrown away in 3 months. Clinique and I had a falling out last year over Perfectly Real, most of Estee Lauder products make my skin feel like its on fire, the super high end brands like Givenchy, YSL and Dior just have zero appeal to me. Bare Minerals is top on my list of hell no, never going there products.
I like MAC mostly for the foundation and skin care items. I agree with a lot of other posters, the whole new LE collection every month is so dumb, what bothers me is none (that I know of) of the products from these LE sets make it into the permanent line.