For me, when I say I like something, it means I like a greater proportion of their designs than other brands (and there will still be designs that I think are horrible). And even though I say I don't like something, I could still find maybe one or two pieces I like in that season, but because the likelihood of finding that piece is so low, I can't be bothered going into the store and looking for it.
So, I like:
Burberry
Chanel
Dior
Valentino (especially their coats!)
Missoni
DvF!! love the fit, the very wearable designs, and the affordable price
Sonia Rykiel
MBMJ
Don't like:
Juicy Couture (but their jewellery is nice)
Versace