I don't have a whole lot of NEVER buys. If it is a good deal, and I can use it to trade for something I like then I will buy any of it. Now for my own personal use, it is a different story.
I have never shot a Glock that I liked. They don't fit my hands, and I HATE the triggers.
Loricin, Phoenix, etc. are to low quality to bother with.
Not a big fan of the big supermags. I can shoot your .338 etc. The recoil doesn't bother me, but at 2x's the money I will stick with my ole 30-06 and .308 unless I go to Alaska or Africa. (Same with your 454 and 500S&W handguns).
Tec 9, Uzi, etc just don't hold an appeal to me, so those are out too.
Not a huge AR guy, they are nice, shoot good, but for what I want to do with most of my guns they are overpriced. (sold my Colt years ago) But that could change, if I find a deal on another one. Bang for the buck they just don't flip my switch.
I happen to like guns, bolt guns, lever guns, semi, revolver, pump, single shot etc. My main concern is getting a good value for my money. Lots of NICE guns I am never buying, unless I get a real deal then I will likely change my mind. BTW I like Rugers, they tend to give you a very good value, Marlin's are a great buy, Remmington, Mossberg, Savage, Stevens, heck my old Taurus P92 has got more rounds through it than many people ever shoot in their life, and it keeps on a keeping on. Just want to get my money's worth. Ugly don't bother me so much if it works well for the $$$$.