In analyzing a player's performance/value (in terms of determining honors and accolades), I always look to the player efficiency ratings. Not counting Candace Parker (insufficient number of games played), Charles was second and Catchings was fourth (Fowles was first, with Penny Taylor third). Catchings led her team in points, rebounds, and steals. She also shot 43.8 percent from the floor, the second best shooting year of her career (one of the knocks on Catchings against her MVP candidacy in previous years was her shooting). She was the only player in the WNBA in the top 15 in points, rebounds, assists, steals, and blocks. Her team did finish first in the Eastern Conference.
Ironically, Catchings' numbers were better last year when she did not win the award. But Seattle won 28 games, and Lauren Jackson put up very good numbers.
In this case, however, there definitely is a "career achievement" feel to the award. Catchings was one of the best five players in the WNBA this year. But there was also a perfect storm. Both Lauren Jackson and Candace Parker (two previous MVP winners) missed too many games to be considered for the MVP award. Minnesota had the best record in the WNBA, but had tremendous balance with Whalen, Augustus, and Brunson taking turns as the best player on the team in a given month. So there was not a clear leader, in terms of a previous winner or a "best player on the best team" perspective. And like I said, Catchings was a worthy candidate, as was Tina Charles (and others).
And, when push comes to shove with other things being equal, Tina will have more opportunities to win an MVP award than Catchings, as she is nine years younger.
But it all depends on how you define the award. If someone were to define the award as "the player most valuable to her team," then you have to look at the player who did the most for her team and whose team was lost without her, coupled with putting up near-historic numbers that have yet to be achieved in the WNBA (15-5-5 and 50/40/90). Based on that definition, my vote would have gone to Penny Taylor.