How long? Hell I've been bored since 2005. Last real FPS that captured my interest completely was Farcry. All the rest have been sorry sad attempts to capitalize off the genre's popularity which has induced one of the most oversaturated genres in the video game market history. Seriously it's too simplistic of a gamplay concept to make so many of them. We need to take this genre in new directions for it to keep going, something that's only been done very few times throughout it's lifecycle. I mean at least think of combining it with other aspcects of other genres for once instead of the same old run of the mill style that has been beaten into the ground over and over again.
I mean I like an FPS just like everyone else, but like every other genre I can only play the same style for so long til I get bored.
