The battery drain while sleeping issue that you had isn't some fault of Linux, it's just a configuration option that Asus set. There are multiple sleep modes in machines with ACPI - apparently they chose "suspend to RAM" which allows for extremely fast wakeups but uses some power rather than "suspend to disk" which takes longer to wake up but uses no power. Windows and Mac OS would behave the same if configured this way.
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Don't blame Linux for Asus' default settings.
The battery drain while sleeping issue that you had isn't some fault of Linux, it's just a configuration option that Asus set. There are multiple sleep modes in machines with ACPI - apparently they chose "suspend to RAM" which allows for extremely fast wakeups but uses some power rather than "suspend to disk" which takes longer to wake up but uses no power. Windows and Mac OS would behave the same if configured this way.