I'll jump on this thread.
Olamic 247
Good people at the company, mediocre knife that really isn't worth the price tag. But when they hit the target, it's a bullseye.
Most ZT's, although the customer service is great
Most spydercos. A lot of great designs with poor execution, higher than warranted price tags, and mediocre customer service.
Hinderers. Bad customers service and truly overhyped knives. Epitome of a patronizing company trying to soak every dime they can from customers.
Chris Reeve, outstanding customer service, great manufacturing, poor designs that are way too long in the tooth.
Now to add some positive comments.
Ontario rats of any shade. Worth everything they charge and more. Excellent value.
A lot of cold steel knives. Some wonky designs but they do them well at a very good cost, usually. Them stepping into the higher class steels was great, especially considering how well the steels perform compared to competitors. Love or hate the man running the company, he puts out some stuff worth considering.
William Henry. Way underhyped. Very nice knives. If you're willing to spend $1000 on a dyer or rockstead or whatever as pocket jewelry, consider a william henry instead.
Some ZT knives. I know i said that ZT was almost always overhyped, but that's really the rabid fanboys' fault. Some of their stuff is really damned good for the price. I wish the fanboys would shut the hell up and allow people to dislike the knives if they want to.
And finally, with so many wide ranging designs, if you can't find a spyderco to match what you want or need, you aren't trying. Spyderco is usually overpriced and they produce some real duds, but my edc is a pm2. The other knife sitting on my dresser waiting in reserve is a 204p military. They also support some really good causes and Sal is a really nice person. Once he's gone I don't see the company progressing much. I fact, it'll probably go the other way.
The collaborations I've received from Massdrop have been really great for the price. When they sell various knives at MAP, obviously there's no deal to be had. When they produce a knife manufactured by WE or Reate, hot damn. The price to performance ratio is untouchable.
Edit:
Oh. And protech. They made some outstanding spring assisted knives if that's your game. I rarely hear them pop up in discussions but they're a very good company making very good knives, depending on your wants.