"I like it" or "I don't like it" has value---but not as much as real numbers.  Real numbers are tied to specific CRITERIA: 1) how much will it coast to implement?, 2) how much will it cut down on wasted hours?, 3) how long will this solution last?...etc.  Ranking ideas or potential solutions by desired criteria tied to actual numbers can take evaluation out of the subjective and into the objective.  Thus I might see that my favorite idea is a bust.  Or, that someone else's idea is better!  Determining Criteria forces me to ask the key question: "What are we trying to achieve?" and then "How effective will this idea versus that other idea be in actually achieving the desired result?"  Yes, we can deal from our gut reactions.  But it's much more powerful when we have actual data (numbers) to back up our superficial preferences.

Dan