I think the majority of us can agree that Remington .22 ammo sucks.
Other than that, I find what my gun shoots well and stick with it. Ones it doesn't shoot well, I don't use. However, just because my gun doesn't shoot them well, doesn't mean that another one won't, so I can't say they are bad.
Power Belt bullets for muzzle loaders are one other thing I would consider bad. They were very accurate for me in each muzzle loader I shot. I always shot the 295 grain hollow point ones. However, after hunting with them I realized I wasn't getting a pass through in most cases, and while they were killing deer, I very rarely got a blood trail. Friends started using them, with the same results. I found a couple deer just by sheer luck, or seeing where they ended up falling. Then, when I shot one and it fell over flapping around, and then jumped up and ran off after 30-40 seconds of kicking, and the only spot I could find blood was on a small tree where it rubbed up against it, that was it for me.
I finally switched to something else and got much better performance. Looking around online, I see this issue along with fragmenting is very very common to the Power Belts. Most of my friends have now switched too although there area about 3 of them that are still hard headed and refuse to switch. Each year, they shoot deer and can't find them, or any blood. They insist you just don't often get a good blood trail with a muzzle loader, when in reality, it's that you don't when you use those bullets. I don't understand why they refuse to switch like the rest of us other than that's what the salesman at the store tells them is the best.
The other ammo I've had a lot of issues with is Remington shotgun shells. I have had a lot of jams with them, when at times I thought it was the guns. I had one blow apart in the gun. The gun shop thinks it was a bad shell, but I'm not convinced. Either way it was a Remington shell and a Remington gun. After that incident I quit shooting them and started shooting Winchester Supreme X buckshot and to my surprise the failure to eject rate went way down. These things have never given me any problems, and overall I realize how bad the Remington shells were after using something better.
I've not had enough experience with Remington Core Lokts to comment much on them. I shot some in the 30-06 above that only liked the Fusions and they shot horribly like everything else, but that was probably the guns fault, and I never have shot the Core Lokts in anything else.
Some ammo I really have had great luck with has been the Fusions in 150 grain for a 30-06. When I couldn't find anything that shot even half way decent in this gun, I finally found these things that shot awesome. I'm talking 1.5" groups instead of the 4-6" groups that were normal for this gun. They did well on the one deer I shot with them too. I really like these.
I also like the Federal Power Shoks if they shoot well in whichever particular rifle I'm using them in.
Winchester Power Points seem okay too as long as they shoot well in your gun.
Hornady SST's are another round I really like.
For pistol calibers, I really love the RWS ammo that Walmart used to sell. However, I also like the Federal Champion in various calibers as well as the Winchester White Box.
I really could just go on and on about the ammo that I really like, but other than those 3 listed above, I can't think of many I really truly don't like. Sure not all of them always shoot great in every gun, but for the most part I've had good luck with most of what I've tried.