I think what happened here with the Monks ability scores is a good indicator of the problems that face Monks in general. While a Fighter or Sorcerer has one major attribute and a couple minor ones, the Monk really needs to be strong in DEX, WIS and STR (if he plans on fighting much. CON would be nice too.) This puts a lot of strain on your ability scores; unless you are extremely "lucky" with your dice rolls its hard to be an effective fighter.
All the advice about Tumbling and Spring Attack is valid as far as it goes - dont get hit unnecessarily! - but you just cant stand against a big, tank creature like an Ogre or a Bear. He will rip you 10-20 points of damage the first time he hits you (which wont be long) and you'll have to Tumble back out to save yourself. (Then the Ogre is running amok among the spellcasters, while the Monk ponders the meaning of the Bushido code "Never run from a fight".) Its a lot like having a Rogue be the front line fighter because he's the "best" fighter in the party. Not a good idea. Also, Spring Attack is at least 6th level, so I wouldnt even worry about it at 2nd.
On the positive side; I think the Monk is weakest (in comparison to the rest of the party) right around 3rd level. At 4th your damage goes up to d8 and your AC increases by 1 (or 2 with a well placed attrib point.) These both make a big difference in your effectiveness; although, still, standing toe-to-toe with a Troll is a bad bad idea. Also, around 4th level you begin to see that your Skills are better than a lot of the other classes; Hide and Move Silent especially will be good for Half-Orcs. Balance isnt bad, Jump isnt bad and Tumble is awesome. (Spot is unfortunately cross-class.) If you can survive to 4th, I think Monks begins to improve. But you should find a real front-line fighter for your party.