Quoted from PanzerFreak:.
Keith Johnson is a genius at creating deep objective based rulesets as they work every feature and shot on the playfield in interesting ways. LOTR, TSPP, WOZ and TH all require the player to work the playfield in unique ways.
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These games are too long to play and to go to the wizard mod. So the repetitivity effect is higher in my opinion.
I respect a game as LOTR, I owned it twice, but finally I prefer playing a brutal one BSD for exemple, with more risky/rewarding shots.