Is A/C working normally?

The 20* temp drop from ambient is pretty much industry standard. If you get better, consider yourself lucky. When someone complains, that's the first thing dealerships around here do. If the system will cool down to 20* or more LESS than the outside ambient temp, you ain't gotta problem. Been doin A/C work since 1979 and that's how it's always been. If it's 100 out and the cabin temp is 80, cya later tater.