Raelcreve said:
the whole problem of being a grappler in a gang fight
Say you've got a grapple-focused character. Your party's going up against an enemy of approximately equal number. You grapple one. This accomplishes:
1) Prevents him from attacking anyone besides you, unless he breaks the grapple. And if he's your size or smaller and not grapple-focused, he'll have a tough time of it. Even if he does break the grapple, he's used at least one attack that round. This is good spellcasters or anyone else who can attack more than one of you at the same time. A spellcaster could try to cast spells, but only with no somatic components, and for which he already has material components or focii in hand. I can't tell you how many high-level fights have been cakewalks because the monk or Bigby's Grasping Hand neutralized a major opponent.
2) Also prevents him from helping allies. For example, a grappled cleric heals nobody.
3) If you're a monk, you can use the "damage your opponent option" to do your full unarmed damage against him with no penalty. Your opponent, unless also a monk, can either attack with unarmed strikes, natural attacks, or a light weapon at -4 or use the "damage your opponent" option to deal damage equivalent to an unarmed strike (1d3 nonlethal for medium creatures) at no penalty.
4) Gives the rogue sneak attack opportunities.
5) Admittedly, it makes you more vulnerable to melee attacks, but does the same to your opponent.
For extra fun, get enlarge person cast on you first.
Raelcreve said:
how does anyone else attack if it's one creature
Option 1) Join the grapple. (3.5 PHB p.157) This can help keep the opponent from escaping, because now he has to beat multiple grapplers. And all of them can use the "Damage Opponent" grapple option.
Option 2) Make a normal attack. Ranged attacks have an equal chance of hitting any opponent in the grapple, but melee attacks are always against the designated target. And the opponent loses Dex bonus to AC (=sneak attack) to everyone not grappling him. If he's pinned, he's got an additional -4 to AC to everyone not grappling him.
Option 3) Cast a spell with creatures as targets. These work normally without affecting the ally grappling him. Magic missile is a good example. Sleep works at low levels too.
Option 4) Tie him up. Not listed in the book, but a touch attack followed by use rope, I'd say. (You can also put him in manacles if you've got 'em.)