No, I don't blame you. Trevor Cahill is 21, and has never pitched above AA. Brett Anderson is 21, and has never pitched above AA. And Josh Outman - who's beginning the year in the rotation with Duchscherer unavailable - has but 41 innings of experience above AA. Because of Oakland's tight budget and rebuilding/reloading program, it's a group of relative unknowns that, together, make up probably the most unpredictable pitching staff in the Majors. Without a lot of previous big league experience, we're left having to pick out bits of information from more distant sources.
Duchscherer's probably the best of the starters, with a 3.90 2008 tRA and enough strikes to offset the hittability. He's also the one who just got cut open. That leaves Dallas Braden as the Opening Day starter, which can't possibly be considered good news. Braden's okay and all, but that's kind of like starting your season with Ryan Rowland-Smith. It just doesn't set the best tone. After Braden come the kids and Dana Eveland, the latter of whom isn't the least bit interesting.
As far as those kids are concerned, Outman's got a power fastball and a full repertoire, but also spotty command that saw him throw strikes on just 60% of his pitches over six starts between AAA and the Majors. Anderson's a strike-throwing lefty with the secondary pitches you'd expect from a lefty without a blazing heater, and he's coming off a season that saw him open a lot of eyes. And Cahill has a low-90s fastball, useful curve/change secondaries, and a tendency to keep the ball on the ground (63% GB rate last year), which helps offset his his come-and-go location. All three are inexperienced, but all three have the potential to succeed right now. This is definitely going to test the idea that, while young hitters generally need a lot of experience, young pitchers with good enough stuff can succeed against anyone.
It's an...unfamiliar group, but it's not a group without talent, and it's worth remembering that Sean Gallagher and Gio Gonzalez are also hanging around in case somebody falters or another starter gets hurt. So it's not like the A's need to live and die by the rotation they'll have going next week. Overall, I'm going to project the rotation to be somewhat below-average, since there are bound to be growing pains and nobody stands out as a potential immediate ace, but there is a lot of upside here that may just be realized. Just because you might not know who (m)any of them are doesn't mean they're bad. It just means you could be surprised. (Alternatively they could suck a lot.)