I agree w/you BG about the relative ease of getting a 'perfect' game in Tactics as opposed to XII...albeit it's not impossible (I'm working on one now and just finished helping to write a perfect game faq for gamefaqs and neoseeker.)

Tactics replay value is in its simplicity...you position your troops, (think chess) use a little strategy, and whoop @$$. The job classes/associated abilities allow major tweakage to this great concept as well. ^,^