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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Personally I appreciated mass effect and skyrim's skyboxes. They always seemed massive and many a times I'd take a break and admire some artists pain-stakingly detailed art work.