5. That would be a boring game, so I started exploring the individuality of each faction. The framework - each sub faction would have 1 sword/slash unit, 1 archer/pierce unit, 1 pike/specialist unit, 1 cavalry unit, 1 elite(archer or sword), and 1 toggle unit. The only difference that could be considered an advantage given this structure would be gaining 1 elite unit that you don't have. Sword if you are lorien or mirkwood, archer if you are rivendell. Thus a 3rd faction is really just for eye-candy. Sure the cavalry are slightly different, but it doesn't have an impact. So units-wise, they are roughly the same, and calling allies will give you a very slight supplement for the 2nd faction and virtually nothing except eye-candy for the 3rd. The adjustments/specializations of the faction are there, but are minor in the over-all picture. The units are put together with the faction as a whole in mind. Elves <> greater than all other factions.
so basicly limited, you wont get ALL units.. just the one said there(elite sword or elite archer), wich would still need backing up by your own units.. so you wont get an OP army... just a good supplement of your own army.