Was there anything you did to overcome it? I don't want to bail on the band all together though because I have nothing else lined up, which is a real shame.
I was in that situation far too many times when I was starting out to not have it suggest that maybe I'm a moron.
But eventually, I figured out that the most important thing in joining a band, and I do this before I play a note or before I hear a note from anyone else, is to make sure that (1) Everyone in the band is on the same page in terms of their short and long term goals with the band, (2) Everyone has the same level of commitment to those goals, and (3) They can actually state the short and long term goals, as well as a tentative gameplan to try to achieve them, in some detail. If they have no idea what their goals are, or don't even have a rough gameplan, I tell them to figure that out and get back to me. It's not worth wasting my time with that situation.
You can still have problems even if you go over the three points above, as folks' goals and priorities can change over time--for example, I had a guy who had been on board freak out in the middle of a tour because he just couldn't stand to be away from his wife any longer. He left the same day he announced this--he just headed for the nearest Greyhound station and took a bus all the way from Oregon back to Florida; he even left his gear with us. So then you're stuck until you find an emergency replacement. (He was newly married, by the way; I always half-joke that the newly married guys have a problem with that, but the guys who have been married much longer have a problem if they're off of the road for too long. ;-)
But if you've sorted out the goals beforehand, you know that at least for the time being, the rest of the band members' goals are the same as yours, and the person who develops different goals can more easily be let go and replaced, since it's clear to everyone that you're no longer interested in the same things, which you made explicit from the start, and so it's in everyone's best interests to part ways at that point.
When I'm joining a band, I care FAR more about the above, and whether personalities mesh, than I care about members' current musical abilities, or even what genre of music we might be talking about. Individual musicians can improve their skills--and if the personalities mesh, you can work with them on that, plus you can write and arrange music with their skills in mind, but if people do not have the same goals in mind, you're going to be dead in the water no matter how good they are. This is just as important if you're interested in giggin at the local bar once every two months, or every weekend, or whatever you're interested in, as if you're trying to do music as a full time career. If folks don't have the same aims, there are going to be problems.
And still in front of individuals' skills and the exact genre, I think it's more imporant to establish more broad-level musical approaches--for example, whether the other folks like to do the songs the same all the time or change them around all the time or something in between. Those are taste and personality issues that are again more important than the exact genre you're going to be playing, in my opinion (although partially because I like all kinds of music), because if there is a strong disagreement on those approach issues, there's going to be regular dissatisfaction with the situation from one or more people.
So what I'd do if I were you is to first talk about these issues with the rest of the band. Say, "I am frustrated in that I do not think we have the same goals--just what are everyone's goals?" and if they're at all similar, "How are we going to reach those goals?" If you guys can't come to any kind of agreement on that stuff, I'd maybe keep jamming with them when they get together for now, just so you're getting the experience of playing with other musicians, but at the same time, look for another situation where people share goals, and once you find that, leave the first band and concentrate on the other.