I have never had problems with any of the discs I've bought. I guess I was blessed with a good writer (Pioneer DVR-104). DVD-RW's though won't play right for more than one burn, after the second my Sony DVD player won't play the outer tracks (the end of the movie). I know, it's a Sony but for now I will have to live with it...
DVDinfopro is an essential tool to see what kind of media you're actually getting.
Example: A co-worker got some DVD-Rs (Memorex) and gave them to another co-worker to burn some DVD-Rs for her. The burned DVD-Rs work fine for most other people at work, but most of them don't work on her new JVC DVD/VHS combo, her Dell PC, and another DVD player her ex-hubby has.
But they work for everyone else at work. A review of DVDrhelp finds that she could have anything from media that is very good, to iffy, to downright junk on the worst type (one user reported an "illegal medium" message from Nero).
Brand name means nothing. They will change around the manuf. and you'll never know. I've learned this.
I gave her one of my Riteks to test. Worked absolutely perfectly.
With Fujitsus, you can check out the label. If they are made in Japan, you've most likely got Taiyo Yudens. Congrats, one of the very best quality media. Otherwise, you've got much iffier stuff.
The Riteks that should be avoided are the orange top ones that are floating around at less reputable vendors. Sounds like C grade media that got out into distribution channels. As well as a bunch of them with waterfalls, trees, etc on them. Very generic looking.
I've tried Princo dyes, Optodisc dyes, Prodisc dyes and all have been utter crap compared to Ritek A-grade. They tend to be OK for data, but video DVDs will often stutter and break up in the latter half of the disc.
TDK, Verbatim etc are also very good indeed but too expensive and are usually branded with the company logos. I like my discs completely plain because I've got a little TDK thermal printer that does a grand job of on-disc images.