I agree with a lot of what was just said. Especially the stuff about people not reading the OP. Some of the responses here are way out there.
I disagree about it taking longer to write quality songs. For many reasons, the first being that a quality song is completely subjective. Having someone in the band that feels the way el raro does will absolutley slow the process. Not knocking you or putting you down, it's the way you say you work, and it will take you longer to come up with material than others. You may very well come up with lots of quality songs, have a lot more commitment to the writing process, and be way more productive than someone who can just bang a song out. I haven't written anything I'm excited about in a really long time, but most of what I've written that I think is really good came out of me almost instantly.
The bands I've been in that have taken the longest to produce anything are the bands that have guys that just constantly shake their heads "no". Other bands smile at what each guy/girl comes up with, and says lets go with it. That attitude keeps the creatifve juices flowing, keeps things fun, keeps everyone feeling good, and produces lots of material. I think it's much better to keep moving forward with newer better material, than to tweak and change and rearrange and work to death the old. Admitted, if you want songs to be decent you have to put some thought, care, and time into them, but I think it's important to know what's "good enough" what works, what beating a dead horse is, and be able to move forward to the next. Perfectionism has been the #1 slayer of my muses.
Last thing I want to expand on from my last post is I think when writing material it's important to be willing to try different things, and find what works best. When collaborating that usually means bedroom rehearsals for me, with one or 2 of the other writers. Sometimes it means a guitar player working out an entire song and then one of the other mambers making it come to life. In The Nerve the singer came up with a lot of stuff that was just acoustically strummed songs. Kinda boring and lifeless. Our writing relationship worked well because the guy was completely open to me bastardizing his songs.

We came up with some pretty interesting stuff, IMO, because of his willingness. I'll give 2 examples:
Television | Joe Nerve
I Feel Like Singing | Joe Nerve
What usually works quickest and best in my experience is if one person comes up with and entire song, music and lyrics, and then lets the rest of the band do their thing. I think it helps in this instance also if the writer either A. has written all parts and knows exactly what he wants, or B. lets the band do their own thing and trusts that they'll bring the song to life. When someone writes something with a vision in his head of what everyone else should be doing it in my experience usually winds up a train wreck, and a big waste of time. Not that it can't be done, but I've found it to usually be a grueling experience.
As already said a bunch of times I still the most important part of the whole thing is the willingness of everyone. If you guys are committed to doing it and everybody's willing to put in the time and work, it's totally and completely doable. Even with a minimum of talent and experience. Not saying that's the case.