I think 2 player vs would be fun. 4 a side is a little hectic.
Thing is you really need 4 infected to be able to stop a half decent team.
If you only had two, by the time you got a pounce/smoke whatever on someone, you would have already been shot off and your teammate would have taken their chance and been killed too.
With 4 you can coordinate to really cripple team by keeping stragglers behind and setting up a trap for the guys coming to save them, pounce/smoke unboomered guys so their teammates can't see them etc.
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Thing is you really need 4 infected to be able to stop a half decent team.
If you only had two, by the time you got a pounce/smoke whatever on someone, you would have already been shot off and your teammate would have taken their chance and been killed too.
With 4 you can coordinate to really cripple team by keeping stragglers behind and setting up a trap for the guys coming to save them, pounce/smoke unboomered guys so their teammates can't see them etc.