I would personally say 2. My order is 2, Reach, 3, 4, ODST, CE, and I haven't played 5 yet.
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Edited by Jotaro Kujo PhD: 2/27/2016 5:57:31 AMJotaro Kujo PhD
I finished my PhD, but at what cost? - old
From best to worst: Halo 2 ODST CE Halo 3 Halo 4 Reach Halo 5