Broadsword and Luna's Howl do that quite well, in that they're good options in PvE but never the best. Mountaintop is almost certainly just "right place, right time" due to the strength of Grenade Launchers and the heightened attention surrounding Spike Grenades. Post-inevitable-nerf, I hope it goes back to being the best GL for PvP (which it should be) and just a good choice for PvE - not something that beats out Power weapons and Exotics. Recluse, however, is by far the worst creation Bungie have made. It trivialises both PvE content and every good weapon you could ever get from it. Master of Arms needs to be far more situational. My idea for a nerf would be to make MoA only trigger from kills with other weapons, slightly lower the damage output. It would still retain the PvP functionality of getting a kill with a better weapon and then having 10 seconds (up to 5 to swap, then 5 of actual duration) to utilise a pocket death machine, but to maintain it in PvE would require a lot of weapon swapping.
Can't agree more. PVP pinnacle weapons that are more effective in PVE than PVP. LoL!