In my opinion the combat system must have about 12 attacks for every hand (same attack ideas for the left hand too)
The combat must have Hand 2 Hand system with legs attacks and a Headbutt(attack with head) and also Grappling system avaible for the H2H only for more fun. ([censored] boring 3 fist attacks!!!)
The HeadButt(Attack with head will be the stun)
If u use boots u get more dmg for kicks and if u use helmet u get more damage for the HeadButt and a bonus stun duration.
The combat must include also use of 2 arrow keys (UP + RIGHT+ Attack)
There must be a synergy between arrow keys and attack animations (When u press Left+Attack u swing the weapon to the left not u charge forward FFS like in some games)
The combat must have moves with all effects: Stun, Knockback, Knockdown, Down Attack(If u are knockdowned the most attack will not hit u so u will need to use a special attack that deals more damage when u are on the ground and less dmg if u are on your feet), PowerAttack (Channel and attack then simply give more dmg without any effects), 360 Spin( AOE dmg attack consumes more stamina but u dmg all the enemy around u and u throw them back 2-3 steps.)
If u can block permanetly by holding button then u must have: Block Opener( If u get hit by this attack when u are blocking u will not be aible to block again for 3 sec)
Cut Throught BLock (An attack the cuts throught block, just damage 1 strike, it does not intrerupt your blocking afterwards)
If u want to be more arcade maybe this will not fit TES: Catapult\Air Lunch Attack: U lunch the enemy into the air then jump and attack him while u both are in the air)
U will also had an attack that smacks to the ground the enemy after he is lunched in the air
This moves should also be avaible for shilds also, i dont mind if u use 2 shields in he same time or even a Double Handed Shield Attack System lol.
Is boring and [censored] ffs not to be able to attack with shields.
Every time u get hit there must be hit animations and u are trown 1 step back while the attacker goes 1 step forward.
All the special moves will have CD(Cooldown time) so u cant spam them, The stun will have longer CD(11 sec) while the Knockback will have less cd(4 sec)
If u equip and item will lower your movespeed and if u draw your weapons u lower your movespeed even more.
Right now the Skyrim system is stupid i have 384 armour and abot 250 life and i got killed with 1 hit by a guard, i was like WTF?