I am not a fan of the DR system as it stands, all the advantage is with the SL club. I am not opposed to a controlled loan system but DR just seems to open to potential abuse.
Imagine coming upto a key game at the end of the season only to find your opponents have signed some quality DR players for the day. Or how about you play a side with DR players and get beaten twice to find they are recalled when they play your nearest rivals?
In the cold light of day we have to make use of any advantage available to our opponents, but that still does not make the system right.