Aren't as fun? I've never mentioned it as being fun. I guess you didn't read all the commments, the last one was dead, and the future ones will be dead as well so everyone can stop argueing with it being wrong to have a mouse drowned by crayfish.
Also, last time I checked crayfish don't have the ability to shred or rip anything apart. The dead mouse goes in, a couple crayfish find it, eat for hours, leave it alone, more find it, eat it for hours, and the process goes on for awhile. This is what I like about it, all the crayfish can eat until their full and there is still left over for others. There isn't much fighting and I never have to worry about one not eating.
My crayfish are active, fast, and seem very healthy. Thats all I care about, who cares if their diet isnt filled with nutritional value found in a little dull pellet. A wild crayfish isn't worried about nutrition, its worried about survival.