Are they always incompetent? I was pulled up because of their error and delayed 23 minutes.

Rare, but could happen to anyone.

I always go in.

After they remodeled and became a "McCafe", they really went downhill. I was in the drive through this morning and finally gave up waiting for them to take my order. I left without ordering. I won't make the mistake of going there again.

Yeah, unfortunately, you have at least a 50/50 chance of encountering an error with your order. I've been lucky so far.

I've never had problems at this location

I have never had any problems with this location.