I think they may be looking at the common denominator more than anything else. Tribes 1 and 2 rocked in my opinion and are still two of my all time favs BUT apparently not enough other people felt that way or Dynamix would probably still be around.
It seems like the dev team is trying to appeal to Tribers AND to the UT/Q3/etc. folks in order to generate sales and popularity. I hope it works....personally I'm a big original Unreal/UT fan but UT2K3 and 4 don't really do it for me.
Tribes Vengeance beta however is rockin my socks atm and is #1 on my "To Buy" list.