Halo 2 for me, every mission was enjoyable except that one mission similar to The Library from Halo CE (Sacred Icon I think); hallways and Flood for 20 minutes.
All Halo campaigns with the exception of 4 and 5 in my humble opinion are excellent though.
English
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That forerunner gondola ride at the arbiter was horrible.
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It's my favourite halo game but God did I hate that part