Over at BTB, there's a lengthy post up with charts and tables, walking through the runs above/below average for each team defensively (in terms of its positional players, as compared to pitchers) and offensively.
Not surprisingly, Texas is near the bottom (though not dead last) in defense, and near the top in offense.
Aggregating the two, Texas's positional players are still well above-average. Milton Bradley is one of the worst defensive players in the majors, and no Ranger was in the top 20 defensive players (shocking, I know).