BFG 9k or 10k?

is it just me or does the bfg work just like quake 2's bfg?

both are literally the same thing.

The only ID BFG that doesn't act like Doom's are the Thunderbolt from Q1 and the Q3 BFG which is pretty much a stronker Plasma Rifle, even the Dark Matter Gun from Q4 could be considered similar to the 9/10k

Yup. It's pretty much Quake 2's BFG!

I just wanted to chime in and and say Doom 3's sucked the high hard one.

The bfg right now lacks the oompfh that I expected from it. Perhaps the upgrades you can unlock for it will make it the powerhouse I am expecting.

I am pleased with the BFG in Doom 2016, quite a spanking weapon.