While Fuller can be very outspoken, his products are superb. Here's what's always good about them: First, they are very well made, and suitable for professional use. A good example is the Clyde (and Clyde Deluxe) wah that The Fight mentions in his post. Most wahs are very susceptible to hums and buzzes from wall warts, power strips, power supplies, etc. So Fulltone uses a steel housing that is made to effectively shield the innards from stray RFI and EMI, and I find that it works better for that than the other wahs I've owned (and I've had wahs on my pedalboard since 1967...and have tried about everything!). Most fuzzes use the old standby cast zinc housing that doesn't really do the job as well.
It's just one example of how Fulltone "gets it." Also the wah sounds great and is musically useful (some wahs are phenomenal in the store, but get them into a session or a gig, and you're disappointed).
Second, Fulltone's fuzzes are IMHO the most authentic vintage-style fuzzes out there. I like fuzz.Most people don't realize that a good fuzz can do nice things even to clean tones, and in fact, that's how Hendrix got a lot of his sounds.
The Deja Vibe is a very accurate clone of the original Univibe. Sure, you can get weirder and more syrupy ones, but they're not like the originals I remember for the most part. Etc, etc.
Of course, the OCD is a modern classic, so many players have one on their pedalboards, but the other ODs they make are extremely awesome, too. Then there are the tape echo units, that are clearly the most vintage-accurate and well built tape echoes on the market by miles and miles and miles and miles....and miles...
I think I've had most of the Fulltone stuff on my board at one time or another, and haven't ever been disappointed. Obviously, some things I prefer to others, but that's why they make lots of products.
I should give the usual disclaimer that I like other pedals, too!