I am always a little confused by people that say that monks are crap. truth be told the monk is one of my favorite classes. played one recently. i rolled stats reasonably well, so i was already quite kickass statwise, albeit with a good belt. Kit i also managed to find/afford included monks robes (but with speed bonus instead of unarmed damage) glove of arrow snaring (bought after first fight) originally started with RoP +2 and bracers of armor +2 cloak of res +2. my skills were a strange mix. but with my speed being 80, and monks getting insane bonuses to jump, i could potentially make 100' jumps.
Feats wise i went through the three crane style feats, dodge, combat reflexes, bodyguard, in harms way, imp trip, ki throw, stand still. these were all possible by tenth level using human bonus feat and four monk feats. i also went for the quingong archetype, and swapped slowfall for being able to cast barkskin.
i decided that my monk was going to try to be a damage soaker, rearranging the battlefield using ki throw, and protecting allies. He doesnt do much damage, just d10+4, but is not that good at hitting as i always fight defensively (for the crane style feats to kick in). what he is good at is not being hit, and tripping people and moving them away from the softer targets.. and even the adamantine full plate fighter is a softer target in our party. when totaled my AC is 34 and on the up. this is before the cleric has buffed my stats (if he ever gets round to it) and the crane style feats essentially let me ignore one successful melee attack a round and get a free AOO against attacker (and the gloves help against ranged). generally i position myself adjacent to the big hitters and trip, or throw enemies over edges etc.
He saved peoples lives on a number of occasions, by pulling enemies off them, or taking damage that would floor an ally.. he worked quite well, and is fun to play. my standard tactic was to stun, trip till they are down, then hit them with remaining flurry.. or trip and throw them so the hitters are flanking them (and i am adjacent to all three).
if they decided they want to eat a caster or the (ranged) rogue i tended to position myself on the enemy opposite my ally and throw them away from ally so they cant 5' to hit them again. this means they had to try to hit me (and usually fail), tumble round me (again, doesnt happen much as CMB is so high), try to move round me or away and attack, if i hit them with the AOO they are staying still thanks to the feat, and have to attack/miss me. if they withdraw they get to do sod all else, and you can bet with my speed 80 i could get to them next round. if they did get round me and get their single attack against my ally, i get an AOO to boost ally's AC by +4 as an aid another (my traits gave me +4 on aids instead of +2, and any of my AOOs get a +1 on attack) if they still hit, then i took the damage for them.
So yeah.. 'walls' dont have to be boring, and monks can be a valuable first/2nd row fighter. of course, i will still get swallowed whole at some point..