The good wing loading range of our models varies with size. What is light for a 100 inch span aerobatic model would be deathly heavy for a 15 powered one. It's that ol' "scale effect" thing working again.

So you need to compare apples to apples and look at other similar models of the same wing area give or take about 10% size. If it's on the heavy side of the range for this size category then it's heavy.