spears should be half put in the game if that makes sense.. by this i mean that they should be in the game, but they don't need killing animations for every creature . how would they get away with this you may ask?
firstly.. the player should be able to pick up a spear to put it in his hands, but the player should not be able to keep it in his inventory (remember that spears are big, this is easily justified) . also large creatures (giants or ogres or daedra for example) might have unusable spears (that are freakishly big)
secondly the type of "spears" available should be limited.
an iron spear
a few weak iron spears with different heads
farming tools like rakes and pitch forks
a dwarven,elven or dremora spear would be alright
this means that spears are much more limited than other weapons (similar to how medium armour in morrowind was useless because its best set failed when compared to heavy and light armour's best sets)
thirdly the use of the spear doesnt need to be complicated... simply using it defensively to ward of attackers and stabbing. mounted use and throwing would be awesome. it should be usable with a shield or magic but not another weapon . it doesnt need a block.
finishing animations should simply be an underarm or overarm stab that may involve a twist or the opponent getting stuck on the spear for a fraction of a second.