表达方式是否正确？

这种表达是否正确?

Whether  we should work by machines is an issue which has generated a heated debate. 

grammatically it is correct; logically, the expression is confusing and ambiguous.

the second half is ok, except, for a restrictive adjective clause, try to replace which by that to make it more formal.

the first half is confusing. the word work is very general. without any modifier or a specific context, the reader might be lost here.