. . . a landing where you can fly your trainer again is a good landing . . .
So is one where you only have to bend over once to pick up your plane.
1st rule of deadsticks is to yell "Deadstick!" so all the other pilots can get ready to enjoy and then judge the crash.
2nd rule is to keep the nose slightly down to maintain airspeed and thereafter use the rudder and ailerons as little as possible.
3rd rule is that if you have less that 20 ft of altitude it's time to aim at the softest thing upwind of the model.