How useful does a metamagic need, to be...useful

[Stalker0]

Did you show them to players ?
As long as they're interested in taking them, they're good

If you think some of them are too specific, either group them into a single feat (like the tactical feats from the complete warrior), or use them as a basis for a PrC (provided they share some flavor).



Chacal

While this is important for my game, I like to post my feats... meaning I like to have a "more scientific" approach to determining a good feat. While playtesting always helps, its nice to have a feel for the goal I should be reaching.

 

[jgsugden]

Metamagic feats are very hard to balance. Each feat can have drastically different effects when combined with different spells. As a result, the value of the feat is hard to establish when new spells may be added later on that make a metamagic feat far more useful.

My advice: try the feat out in mock situations. Play around with it. See if it feels broken. Introduce it into the game by putting it in the hands of a bad guy. See how it works. If the feat passes these tests, introduce it on a trial basis ... with warning to PCs that you might alter or completely revoke it in the future.