I would not classify ACDC as deep in that sense either. LOTR, TSPP, WPT, RBION, XMEN, WOZ are all classically deep. Lots to do in those. ACDC has 'lots to do', but it all feels the same. Build up the jackpot, choose when to collect...rinse, repeat.
I agree about ACDC. I don't consider it nearly as deep as say WOZ or LOTR as the rule structure is completely different and tends to focus more on points rather then going through a story based ruleset. The way to score points in ACDC and collect jackpots is complex but the "modes" (songs) are no where near as interesting (still fun!) or unique as those in LOTR or WOZ in my opinion.
The games that I find to be the deepest typically have one or more of the following qualities.
1. Story based, makes you feel like you are on a quest (LOTR, WOZ, STTNG, ST, XMEN, etc)
2. When you complete a mission once you can play it again but the rules change to make it more difficult (Stern ST)
3. Completing a certain set of objectives leads to a mid wizard mode (WOZ and LOTR off the top of my head with Battle the Wicked Witch and Destroy The Ring)
4. Beating missions offer the chance for a player to collect a reward (LOTR)
5. Offers a final wizard mode
The biggest difference between a points based game and mission based game I find is that the mission ones require a unique set of shots (work the playfield) to be made to complete a mission whereas points based games are just about hitting the same loops or orbit shots again again.
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