A couple tangential Skyrim ones:
1) Gear that's Useless by Design:
Like the magic staves. They ignore your talent points if you're a mage, so you're better off casting what you know to full effect, and you can't get skillups from them no matter what. Scrolls at least gave you the Master spells as one-offs.
The short-swords in Terraria are the same way. Pitifully weak against even the easiest enemy and you're basically guaranteed to take a hit when using them. The very first thing you to is make a wooden sword, so why even waste the time coding the short-swords in in the first place?
2) Boring-ass gear progression.
Skyrim again: every dagger is the same, some just have higher stats. Elven ones don't swing faster because they're lighter, glass can't get better enchantments, whatever. Nope. Every 1H-sword= every other 1H-sword, mechanically. All bows are the same bow.
Mass Effect 1: There's the gun you should be using, and everything else that's flat inferior in some way. I'm not even counting the Specter gear from New Game+, the default worked this way for every weapon type. You couldn't trade fire rate for accuracy in rifles or anything like that. There's just The Best One and omni-gel. Thankfully fixed very well in 2 and 3.
Bonus:
3) Vendor Trash:
Not the gray-text bear asses, I mean when vendors only stock complete garbage you wouldn't pick up if you were broke. "I'm the finest gun smuggler in the twelve systems!" he says, as you browse his stock of BB pistols. Where did those space pirates get tactical nukes and melt-o-rays? Who the hell knows.
Honorable mention to Space Rangers for averting this hard... and points immediately retracted for making you play in-game classified ad searches to find the shit you need.