The National League power rankings will look similar to the American League rankings, it will have a member of each division in the top 3 positions.
The San Francisco Giants have been given top spot because of their World Series victory. Right now they are the team to beat. This would be the case even if they traded their whole team away. Texas was not afforded the same spot in the AL simply because they did what every team could do,–and that includes amateur teams–lose. 

It’s easy to start predicting great things for teams who have added big-name players and have a recent history of success. Even then, a team could disappoint you due to injuries or a simple failure to live up to the hype. This season the Philadelphia Phillies and the Boston Red Sox are the teams for which you could make such rosy predictions.
What’s all this talk about the Phillies? Yeah, they acquired Cliff Lee, and yeah they have a sweet rotation… but the Braves ranked 3rd in ERA last year, and the Phils ranked 5th. Apparently MLVtv and ESPN haven’t taken this into consideration. Not only did the Braves have the 3rd best rotation in the NL… they did it without Jurrjens and Medlen. Booyah.