Since there are so many posts in this forum about vetoing trades, I thought it might be helpful to ask people what kind of criteria, in general, they use to disect a trade and determine whether or not it's vetoable. Maybe this thread becomes a sticky or something for people to read before posting their veto questions. Anyway, here are some general thoughts I have and use as commish.
1) Collusion questions - These are obviously the trades that everyone is worried about. Pujols for Kip Wells...that sort. It's certainly difficult to root out collusion, especially in a league where you don't know the other owners....but some things just stick out as being ridiculous.
2) Could I make the trade - One example I just read was Matt Cain for Olsen+Dempster. Now, I think most people would prefer the Cain side of this trade. But, when evaluating it, I have to ask myself if there was ever a situation where I would take the other side. Certainly, if I was completely deficient at closer I wouldn't be opposed to making a trade like this where I would give away Cain.
3) Unfair trades happen - Before you veto a trade, you have to look at the rosters of the teams trading. As with #2, if there's a team with a particular need, sometimes you just have to overpay to fill a hole. It's darn near impossible to evaluate a trade without knowing the needs of the teams involved.
What other criteria do you guys use to evaluate potential vetos? What other practical advice can you give to commissioners out there?