Please take the invulnerability out of slayer dodge, they are not Tanks and there is no reason for it. If you can not then please give invuln to every back jump or teleport ability to make it even. Can anyone even give me a reason why slayers get an invuln every 4 seconds?
dodge
   [doj] Show IPA verb, dodged, dodg·ing, noun
verb (used with object)
1.
to elude or evade by a sudden shift of position or by strategy: to dodge a blow; to dodge a question.
2.
Also, hold back. Photography . (in printing) to shade (an area of a print) from exposure for a period, while exposing the remainder of the print in order to lighten or eliminate the area (sometimes followed by out ). Compare burn1 ( def. 45 ) .
verb (used without object)
3.
to move aside or change position suddenly, as to avoid a blow or get behind something.
4.
to use evasive methods; prevaricate: When asked a direct question, he dodges.
To answer your question, all melee classes have invulnerability moves. All ranged classes do not.
If you want to know the reason, its because they have to be 1 meter from bosses while ranged can be up to 19 meters away. Most bosses have close range aoe or swipes. Meaning its an important part of their role to be able to avoid damage since they can't dps from outside of attack range.
In reguards to your video its called lag, you probably sitting with 100-175ms ping to be able to get hit, fury strike has a big step forward and if you saw his character never took a step forward which means on his screen you were smack in front of him. Nothing to do with slayer range FYI
Ok first off that's not my youtube video and I have a wonderful internet connection and rarely experience any lag at all in game. Someone else posted it in another Slayer QQ thread and it gave me a chuckle so I posted it here for lols.
Secondly, I agree lancer/zerk block is lame as hell. But so is having an invuln dodge. I sure as hell am not invuln when using any of my sorc's dodges. But whatever it's all pointless anyways since all these new school MMO's fail at PvP. You can never truly balance these class based games for both 1v1 and group.