Red handled oil filter wrench - Normally sold at any AutoZone or Advanced Auto Parts store. This thing is made for any size filter but the little piece of metal that holds the jaws in place for either the small filter or large filter will weaken and then only work with large filters. Truly a POS.
Wagner Paint sprayer - The TV commercials make the thing look awesome. Then you buy the regular unit (the one with the container that screws on to the head) and then you pull the trigger and the thing is as loud as a lawn mower and gives you a headache after 5 minutes of use. The nozzle tip also clogs up right away.
Wagner Paint Sprayer "System" - This is the one with the 50' hose that you drop in to your 1 gal or 5 gal bucket. The first time you go to use it, you quickly find out that the nozzle tips only work if you fully dilute your paint. Then, even after you do that, your latex paint will quickly clock the nozzle during your next 5 minute break to get more paint. What a piece of ****. I finally gave up on it, threw it in a garbage bag and took the whole thing back to HD for a refund. I had wasted almost a full day trying to get things to work and in less than 3 hours I just painted everything with a good ole' fashioned paint roller. Now I always just buy a good quality roller.
i-drive garage door opener - You'll get it "installed" (at least the motor) in record time (min 30 minutes without even breaking a sweat) and then you'll spend 2-3 days trying to get the remotes fully programmed. Then when you call customer support in India, they just reread you the same directions you're already staring at and they ask you to reset the system each time. Then when all is finally set up, you'll hit the remote and nothing will happen. Just when you're thinking of hitting the remote again (cause maybe it didn't take the first time) the door will go ahead and open/close. For some reason they don't advertise the "delay" feature. What a piece of ****. Yes, I do have one installed and am anxiously waiting to replace it. I would have taken it back but Menards no longer even sells the "torsion" unit ones anymore. I should have taken it back the minute I opened the packaging and found no less than 5 stickers saying "do not take back to place where unit was purchase. Please contact MFG at 800 number". I also have a Liftmaster 3800 with battery back up and (even after having used every Craftsman unit ever made) I must say that Liftmaster makes the absolutely best opener in the world.
Craftsman handheld power tools - Sorry, I'm a HUGE fan of anything with the name Craftsman on it but all of these tools always let me down. I think they're all overpriced rebadged B&D units. I'll stick with Milwauke, RIGID, Porter Cable, and Delta.
Any Hand tools from Menards - I bought their impact sockets and they didn't even last 5 minutes while using a cheap impact gun at the time.
WD40 - Other than for rust protection (and barely even that anymore), there are now so many superior chemicals that you can choose from. PB Blaster and Freeze Off are now my favorites.
Craftsman wire cutters - Forget these and just buy anything with the word Klein on it instead. Their wire cutters truly hold up over time and it's no wonder that electricians prefer them.