refridgerator cooling
The Boz is right about making sure you have adequate ventilation. Poor air circulation around the condensor will result in poor cooling and will shorten the life of the cooling unit by a huge factor.
If the unit has been sitting for any length of time, you really need to give it 24 hours before checking the temperature. These things are notoriously slow to cool down when you first start them up.
If you had it on electric, what is the voltage? A few volts low can make a significant differance.
What is the ambient (surrounding air) temperature? This can be a big factor. I had an old unit that was good for 40 degrees cooler than ambient and that was it. At 70, I could freeze stuff, at 80, just nice at 40 inside, but on a 95 degree day, I would have been better off with an ice chest.
Just to check the door gaskets, take a dollar bill and sht it in the door. You should be able to pull it out with just a bit of effort. Do this in several places around the door. It should be consistant. If it practically falls out, the gasket is too loose, if you really have to yank on it, the gasket is pinching and may be opening a gap elsewhere.
hope this helps,
Ed