There are 29 teams that didn't get Yu Darvish, and that means there are a lot of fans who are going with the sour-grapes method of processing that information. By law, fans are required to mention Daisuke Matsuzaka when disparaging Darvish. I mean, they totally came from the same country and everything.
Kevin Goldstein of Baseball Prospectus has a Q&A about Darvish up (it's for subscribers, which you should be), and he details what Rangers fans should expect:
He throws both a two- and four-seam fastball that he commands exceedingly well with good life down in the zone. He normally sits in the low- to mid-90s, with the occasional 96-97 mph reading for giggles, but on shorter rest, he's expected to sit more in the 90-95 range.
And if you needed to see for yourself -- or if you were in the mood for a wicked shredding guitar solo -- here's a video of Darvish doing Darvish things. Skip to 1:16 for some laughs: