It should be doing FAR better than what you're reporting. Have you had an RV fridge before? Compared to residential fridges, they take much longer to cool initially, take much longer to recover from warm food being put in them or the door left open while you figure out where something is, and don't freeze anywhere near as hard.
BUT, it should still be doing FAR better...
Are you able to look at how it's installed? In from the back vent on the side of your coach? Is the fridge in a slide? Or does it have a roof vent?
Installation is VERY critical!!! Our friend Chris Bryant is an RV tech and has a website with lots of information
HERE! Take a look at Installation and Troubleshooting. It'll at least arm you with some understanding.
As I said, installation is critical. Insulation, baffling, and clearances all matter. If the fridge is in a slide, special attention is required. If air flow upward over its coils is restricted or there's too much back clearance it'll have trouble cooling. Same if a baffle above is required and missing. Again, in the slide is a special case.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB