I'm not sure there's any brand that consistently gave me issues. I have had a couple of instances that would sour me on buying from those companies again.
One was with Mushkin RAM. Bought some high speed gaming memory back on the Athlon 64. One stick became defective (blue screens, and memtest showed clear failure of the memory; other RAM worked fine) so I started a return request. I was waiting for the RMA# or something from them but didn't hear anything for like a month (had good communication, then it just completely stopped), and had other things going on in my life (had a family member have a serious health issue), so had forgotten about it. Awhile later (not sure how long, might've been a year, but their warranty was still in effect), I am getting rid of old PC stuff and find the RAM, and so contact them again. Apparently the guy I had been in contact with had left on some extended humanitarian aid mission or something (they talked like he didn't quit, but he had been gone the entire time, apparently they didn't have someone else take over for him?), and so the next person I got into contact with handled it in a poor way I thought and I sent a displeased email about how they were handling it (I did not go on a profanity laced tirade or anything as I've never done that with customer service as it will never actually help things, I just said that I wasn't pleased with being ignored and then all the extra time, and I think they wanted me to do the whole process over - retest the memory and everything, and provide a bunch of proof of purchase stuff, and everything that I had already done). That got escalated to the CEO who then scolded me. I don't know if he didn't know the situation or what (I can't imagine him thinking how they handled it didn't warrant some displeasure from a customer), but I thought that was really unprofessional. He said that they'd replace my memory but that I could take my business elsewhere and wouldn't provide support for me in the future. Which they did replace the memory and I did take my business elsewhere. I actually felt guilty for awhile but looking back, I really feel like they were the ones that handled things poorly.
The other was BFG Tech. I'd bought two of their 6800GT cards to do SLI, and one of them went bad. They sent me an AGP version (this was right around when PCIe first came out and SLI being one of the big features of it), and wanted me to pay return shipping, and then I believe it took an extended amount of time to get the return card (or they ended up not having a replacement so wanted to send me a 6600 or something?). If I remember right, BFG was having a lot of problems and ended up going out of business (after having had a stellar reputation, they used to be like EVGA was), or something where they completely changed (I think some other company bought the brand but they weren't the same ever again).
Oh, I guess a couple of others were when ZipZoomFly and Monarch Computers were basically going out of business but didn't tell people (and were still taking orders and stuff, which ended up with people have all manner of problems).