I really did have my concerns for Titanfall's aesthetics after the beta (Both Fracture and Angel City were pretty bland looking), but then the full game blew me away in this department. Especially outpost 207 and Demeter.
Post nice lookingSkyboxes I guess
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Halo 2. Well pretty much every Halo besides Halo 4 had amazing skyboxes. I remember playing Halo 2 and Halo CE when I was younger and would look up at the sky and just look at everything. It made me think and wonder about everything there is in the Halo universe.