Should I be concerned and if so, what if anything can I do if my attorney is a lemon?

If there is GAL there must have been a hearing. Therefore a notice of appearance is probably unnecessary. Certainly not if he signed either the petition or the response. If you don't like what this lawyer is doing, have him withdraw, refund any money he may owe you and find another lawyer. Unless he is doing this for a flat fee ( if so you can expect him to do as little as possible) you would have to continue to pay him anyway to finish the case, so you may as well pay a lawyer you like and who is responsive to you.

You already know the answer to your question. Run, don't walk, away from an attorney you hired six months ago in an active case, but who has yet to enter an appearance as counsel in the case, doesn't correspond with you, and apparently doesn't do much, if any, work. Don't be stupid and claim that you paid in advance you can't go anywhere else. There are laws governing contractual obligations and rules governing an attorney's ethical and professional obligations to a client. if you're attorney does not perform as agreed and as he is required under the law and rules governing attorney practice, you can clearly and easily demand a refund of what you have paid this attorney. Your state high court and/or bar association will have a department for client grievances and attorney discipline where you can and should go to complain about your attorney.

Report him to your state bar association. Do it now.