So far as later-game weapons go, it must be said:
X4 head + Twin Slasher = pjwnage
fixd~
Please, you can't dismiss Fire Wave and Storm Tornado that easily.
To say nothing of the X1 charged buster being perhaps the kickassiest the series has seen, if not for boss damage caps screwing it over (which X2 fixed).
i made a list of all the useless weapons post X3, i should probably dig it up.
List is worthless if it does not include Blade Armor's buster.
I honestly believe Capcom made that armor so that, if they continued re-using last-game's armor, they wouldn't have to water it down.
Also on DeviantArt, Rumble, DLive.tv, and the Fediverse (@freespeechextremist.com and @bae.st)