Titanfall may be one of the biggest PC games of the year—literally. Vince Zampella, co-founder of Titanfall developer Respawn Entertainment, revealed on Twitter that the game will have a massive 48GB installation footprint. The compressed download alone will weigh in at 21GB, making Titanfall much larger than any other PC game I've seen.
To put things into perspective, consider that Battlefield 4 consumes only about 29GB of storage. Max Payne 3 requires 35GB, which is still 13GB short of Titanfall. Otherwise, the biggest game I can find is Call of Duty: Ghosts, whose system requirements call for 40GB of storage.
On the one hand, Titanfall's massive install footprint could be a good thing. A lot of really big PC games feature upgraded art assets, including higher-resolution textures, that make the environments look much better. I suspect most gamers would be willing to swallow a heftier install in exchange for improved visuals. Titanfall does look very pretty, after all.
At the same time, however, Titanfall's size could be frustrating for SSD users with limited solid-state storage. Sure, folks can run the game off mechanical drives, which provide plenty of gigabytes on the cheap. But once you get used to the faster load times that SSDs provide, it's hard to go back to sluggish spinning platters. If Titanfall is this huge, I don't imagine its load times are particularly short.