If your talking PvE, okay, I will agree with you, somewhat. However, if you are speaking PvP or WvW, no way is a core ranger on par with a druid spec. Bar None. The closest thing a core ranger build can get to being effective is a trap/condi ranger, and even then druid beats that build too. And that build is useless in PvP/Wvw anyway.
As for Ele, I use to think that to for a staff ele. There’s one staff build that is better core than tempest, and thats more of a pve/raid build. You bring that build into pvp or Wvw and you’ll get wiped all over the place..
I don’t play my mez or warrior enough to comment on those two though
Funny you assume hes talking about PvE, I read that list and assumed he must be talking about PvP. Druid, tempest and chrono are definitely BiS in PvE, only burnzerker is out.