Lanefan
Victoria Rules
It's simple, really: the designers realized that having a class that people argue about is important, so to counter the removal of the Paladin they've given us Warlord in its place. 
More seriously: if (and I say if, because we don't know everything yet) the Warlord has a class ability that can arbitrarily and without saving throw force (an)other PC(s) into doing something it(they) would not otherwise have chosen to do, that is Very Bad Design.
As for functioning as a unit etc.: it's not always about making the optimal choices, people! Yes, a smoothly-running military-legion machine of a party will probably be more successful over time...and can be fun for a while, until you've perfected the whole tactical thing and realize nobody's laughing anymore...it's become rote, and thus dull.
It comes right back to the good old Law-vs.-Chaos argument; and for sheer entertainment and amusement (the reasons I play the damn game in the first place) give me Chaotic parties every time!
Lanefan

More seriously: if (and I say if, because we don't know everything yet) the Warlord has a class ability that can arbitrarily and without saving throw force (an)other PC(s) into doing something it(they) would not otherwise have chosen to do, that is Very Bad Design.
As for functioning as a unit etc.: it's not always about making the optimal choices, people! Yes, a smoothly-running military-legion machine of a party will probably be more successful over time...and can be fun for a while, until you've perfected the whole tactical thing and realize nobody's laughing anymore...it's become rote, and thus dull.
It comes right back to the good old Law-vs.-Chaos argument; and for sheer entertainment and amusement (the reasons I play the damn game in the first place) give me Chaotic parties every time!

Lanefan