These refrigerators all operate on the same principle, so there is no reason that your TM refrig should be worse (or better) than your previous refrig. So something isn't right. Start by checking the following.
Is the little fan blowing in the correct direction? It should suck air down through the hose and blow it out through the hole in the floor. You should be able to feel it if you put your hand under the trailer. If it is installed backwards, as sometimes happens, it won't work as well.
There are two 3-inch holes in the floor of the refrig compartment, both covered with screen. The little fan blows out through one. Make sure that the other is open (except for the screen). Occasionally someone puts a cover over this second hole since "it doesn't appear to do anything".
I have always considered adding a second fan - or substituting a bigger one. I haven't actually gotten around to doing it, but increased air flow should help.
Other thoughts. I presume you have set your refrig to run on DC/battery while you travel? When you reach your destination, is your TM battery fully charged, or discharged? It turns out that a fair percentage of tow vehicles have inadequate wiring (mine did) and the refrig can't get full power from the tow vehicle. End result is that the TM battery is discharged when you arrive at your campground, and the refrigerator is pretty warm when you arrive. This is not a TM problem, it is a tow vehicle problem, and you can't fix it in the TM! To check your TM battery, set up your TM at your destination, but don't plug in shore power yet. Instead, unplug the TM from the tow vehicle, and then check the status light panel in front of the sink. If all is well, the battery sequence should read at the next-to-top light. If there is a problem, it will read lower.
If the refrig is set to AC/plug-in power while you travel, it won't work, of course. And I don't recommend that you use propane while you travel, though others may disagree. There are many threads on this topic.
Other than that, there are a few tips for packing the refrig, and adding a small interior fan. Texas_Camper usually covers this pretty well - use the Search tool to find his posts on the topic.
Bill
[Edit - Oops! Just saw that Leon posted while I was writing!]
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