Neither generation has any bottleneck. Console is a highly specialised system and that's what makes it much cheaper than PC, so it can't have superfast CPU and GPU and a lot of memory, but it definitely can have some engineering solutions that are cheap and still can make gaming better. Modern consoles are perfect in these terms.
Also how have you concluded that Cell processor made PS3 exclusives better? Single player games like Uncharted and The Last of Us don't need much CPU power at all because of simple AI, little amount of enemies, low interactivity etc - they're almost just tech demos that rely on GPU. If you want CPU-dependant games, these are GTA 5, Battlefield 4 and etc - they were still better on Xbox 360, so...







