Kensai: master of a specific weapon.
Tempest: master in dual-wielding weapons
How is that silly?
They already throwing the fighter class a bone by translating the 10% Fighter Weapon Alacrity to 10% Doublestrike, whereas the Tempest 10% Dual Wielding Alacrity is translated to 5% Doublestrike and still limited to dual wielding only.
Nothing changed. All other things being equal (ie: build, gear, etc.)
Tempest still (statistically) gets one more off-hand hook. Kensai still does more damage per swing (which more than makes up for the one less off-hand attack per attack chain, not even counting Powersurge).
The only other thing that changed (in regards to fighter vs ranger comparison) is that the fighter capstone has become more useful (in relation to the changes).
Personally I believe they put that in there not because rangers are so much more uber than fighters but to make going 20 fighter more worth it.