The spiked chain weilder didn't really need much to unbalance it. High dex, combat reflexes for the extra AoO, exotic weapon proficiency for the chain and then either weapon finess for attack bonus or improved initiative for first turns (or power attack so you could take cleave next level if you were high strength and dex).
I'm not saying it's a killer character, it doesn't have many roleplaying applications other than fighting (although the human skill points could give you something else to do), it's just really good for a basic, core-book character at first level. Good on attack (10' ranged melee with no minimum range, can trip, can disarm), not bad damage (2d4, with strength add-ons as your second highest attribute), good ac(dex+light armour), good initiative(dex), can handle a ranged weapon well(dex), good on defense (extra AoO's with range, can defend passage ways better than anyone else). First level characters probably shouldn't be able to do all this effectively, it skews battles away from other character's chance to help and makes DMs "deal with" this sort of character.
Adding a level of rogue down the track (you flank a lot of things easily), cleric to keep your health topped up, sorceror (for expedious retreat and true strike), barbarian (for rage and movement) or just more levels of fighter made it a damn good character. It was good at level one, it just gets better and better.
My point is, this is in the core rule-book. 3.5ed just got worse from there on in with broken combos. Most groups don't end up power gaming, and DMs have the right to do very bad things to OP-one-dimensional characters, most players are in D&D for roleplaying not combat gimmicks, but everyone wants their character to be good at something. There's a lot of combat in D&d, so I really hope they think about this sort of stuff. Meshing in the supposedly modular add-ons to make it a bit like 3rd, a bit like 4th, whatever flavour you want, makes this sort of thing very open to abuse.
DMs can regulate this, good players wouldn't do it even if it was included, but if it's not included then no-one has to make the choice in the first place.
(yes, I did play this character at one point to try it. We played a "break the game, over-power away" campaign at one point. It got pretty damn scary just because it had a 25g weapon, a couple of basic feats and one fairly high attribute. 16 dex isn't that good is it?)