Yeah. This one now.
Whilst PoA is obviously heavily iconic, and has surprisingly good design for a level built entirely of corridors, I'm vouching for Winter Contingency; I knew straight off the bat with this level that Reach's Campaign would be a stonker for gameplay and scale, and it generally was. Really enjoyable homage to Halo (CE's second level), looked beautiful too.
Honourable mentions for Cairo Station's zero-G sections and Dawn's brilliant climax and ending.
inb4best middle mission thread
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4 RepliesI'm going to go with Winter Contingency. I just loved the map and especially the vistas it had and the ride in the Falcon, even though it wasn't anything special really. Plus, awesome cutscene. Close second is Sierra 117. I adore that level.