There's a difference between a couple hundred on your screen trying to kill you and your friends, and thousands in the vicinity. I'm not worried. The guys in charge of the pvp made DAOC RVR; If it didn't work, they'd have scrapped the engine early on.
Exactly what I'm saying. The biggest castle sieges I've been to in Lineage II, personally, had about a thousand people
per side actively fighting against each other. for two hours. The recent "Kill Jita" campaign in EVE Online had an estimated 6000 (
six thousand) players in and around the Jita solar system fighting for 12+ hours. Lineage II is 8 years old by now, EVE Online roughly the same (I'd have to check to be sure)
"100 vs. 100" is, if we're being very generous, medium-sized. It certainly isn't anything to brag about compared to already old MMOs.