The following tags were selected based on the criteria that they are too specific to provide a meaningful distinction amongst questions and should be killed or merged. I've done my best to find merge targets whenever I can.
wireless-controllers wiimote --> controllers
Wiimotes are wireless controllers, and I don't know that having three categories that could potentially contain controller questions is really warranted.
retro-gaming --> backwards-compatibility
backwards-compatibility already contains old-games, and that's supposedly the point of retro-gaming as well.
lan --> networking
LAN as a tag is kind of ambiguous, and I'm not sure there's enough of a meaningful distinction that someone interested in gaming on a LAN versus network gaming in general. I'm also kind of torn, since this could just as easily all become "multiplayer" - there are likely few networking questions valid for this site that don't involve multiplayer in some way...
konami-code --> cheats
Cheats is a meta tag, (which might die in a fire sooner or later) but regardless I'm not sure that the Konami code needs a tag all its own.
hosting dedicated-server --> servers
This is a weird group. Hosting generally refers to dedicated servers in the gaming world.
Two game mechanics of the CoD series. There's a bunch of questions about these mechanics that don't have them, and there's not really a need for them since the CoD game question count is pretty paltry.
wiimoteis potentially useful, I could see someone filtering for that.
wireless-controllersnot so much, I doubt there are many questions that apply generically to all wireless controllers that aren't shopping recs, so I agree that one should be merged.