in Dark Mesiah you had 4 prepare-hold-release melee attacks (first person) and 2 quick swings…
The heavy attacks were based on the dorection of movement… so a swing from above head = forward, from left = left, from right = right, from shoulder or smoething = back. +2 quick were jsut right left slashes.
There was also a ground finisher impale.
Mocap first person anims is a bit harder cause you try to hold stuff in front of you as much as you can instead of naturally swing around your bodyhttps://youtube.com/watch?v=xbPQ2aMDTAshttps://www.youtube.com/watch?v=7vSQOYVOrb8
If you make just 1h sword thats more than fine to me 
Most first person anims on marketplace are not mocaped so they dislocate joints in such a bizare way - they are not suited for multiplayer to be seen from a side