Is there a game that does player-set traps well? Something where they are interesting but you can't use them to effortlessly cheese encounters. I guess this is mostly an NPC AI problem where you'd need to find a way to make opponents not run into danger like idiots but also able to be tricked by a sufficiently clever player. But you'd also need the trap setup to be more involved than just dropping glorified proximity-detonated fireballs.
Fallout New Vegas and Fallout 3.
There were plenty of mines, frag, plasma, pulse, gas, freeze.
They are not OP because setting together they can trigger each other but the damage calculation is not very beneficial.
They mostly being used to set as forewarning, wounding, and delay enemies getting to battlefield.
The one exception is pulse mines. IT damage robots and Power armor users only. So if you dont use PA, you can get close to tough robot (or tough PA spawns) and launch pulse mines, each shot will explode immediately leaving your hand. Thus you can do big damage in short time. The limit to this method is availability of both mines and applicable spawns.
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Another situation is Silent Storm and Silent Storm Sentinels (not Hammer Sickles because no applicable)
SS and SSS has plenty of tough spawns in term of Panzerklein. There's very rare battlefield where you can set full selection of mines onto the place they appear. But there's many locations where you can set trap as forewarning, wounding, and delaying.
Extra goody is that both games feature destructible environment so you can use lots of booms to change the terrain.