It sound like everyone is having similar problems.
Easy on the generalization there. I don't think a couple of posts means that
everyone is having similar problems
I have had similar screenprinting issues such as ink cracking very easily on American Apparel baby rib t shirts,
Ink cracking on a t-shirt is a different issue than the garment showing through in the design.
That is a simple and clear cut quality issue on the printers end that shouldn't be tolerated. Although with baby ribbed shirts, since the fabric stretches more than other t-shirt types, if there was a defect in the printing, that's where it would show up first.
ink on one shirt is matt and another is glossy (with no explanation why each was different), words not being straight on the shirt at all to the point that customers notice right away and ask for another one, and some issues with one order where pink print on a brown shirts is thick and vibrant then on another order the pink is very light and brown shows through
Again, these are straight quality issues on the printers side. Inconsistent printing, crooked printing, are all issues that the printer needs to correct or give credit for.
If all of the t-shirts have a slight show through of the garment as the original poster stated, then that could be what the printer assumed he wanted.
Now I know Rodney mentioned earlier the situation discussed above could be related to miscommunication but don't you think also that the screenprinter should be the one to make sure the communication is clear and that the customer knows the variables that could be possible. In my case, it was very clear that I did not know anything about screenprinting and spent many appointments discussing and learning from my screenprinter. And yet still I have issues with quality.
Well, as Solmu put it eloquently...your printer "sucks"

So no matter how many meetings you had with them, the issues with "quality" weren't going to get better.
What I was referring to was assuming that the printer could print a decent shirt and all other factors being equal. Sometimes a customer assumes the printing will be heavy and sometimes the printer assumes the customer wants lighter coverage. Yes, ideally, the printer should ask which the customer wants (but many times the customer doesn't even know which they want until they see the "wrong" way).
Your case is very different than the original poster.
A set of guidelines for screen printing would be great for novices like me with images of what can be expected from what technique etc, with ideas on what to ask your screen printer and what you should expect them to ask you, anyone have any thoughts on this?
That's a good idea. I'm sure there is something like this already in existance, but I think we could write up our own to post here on the forums. A "Questions to ask your Printer" document would be very helpful for both the printer and customer.