One of the things that you can do with macros is specify evaluation order, that's correct. You should also know when and how to evaluate your arguments, as done with the once-only utility (which is really just a thin wrapper around the obvious solution of binders).
But when I said "evaluation order has nothing to do with macros" I meant the kind of macro facility that you use (the original context of this thread was hygiene). No matter which kind of macros you have, the above issues are still the same.
