I had a similar experience with an immigration lawyer. Our lawyer didn't help much besides giving very broad directions, she gave us the wrong paperwork to fill out, which my wife and I had to redo from scratch upon discovering the problem. Then, on the day of the interview with USCIS (the "Are you really married? Show me the proof" interview and evidence dump), our lawyer failed to show up.

My wife and I did the interview on our own and thankfully got through it okay. On our way out of the building, we ran into our lawyer, who claimed that she got stuck in traffic and was very sorry. Needless to say, we fired her and we have filed all of our paperwork ourselves since this incident.

For my naturalization process, I will consider any other option other than a lawyer.