You're just projecting your experience on the entire game, my rapid poison BoM has had people running away in PvP because they came unprepared (I got this idea from Peeve so I can't take credit for that). & yes it sometimes outperforms physical gems in the right circumstances if you're using higher level poison gems, the elemental gems also do great damage against enemies with a weakness to fire or bolt.
Funny, ENB is doing a playthrough right now & the rifle spear & Saw Spear are two of his favorite weapons, plenty of people have used the Stake driver in this very thread although I haven't used it personally, the Reiterpallasch is a great weapon (have you even used it?), & can't believe someone said the Tonirus is a bad weapon? Are you serious?
I'm sorry, but it looks like you haven't played much of the game at all, you just played a skill cane build & called it a day.