Chargers have some players to have a really potent offense IMO. Mathews will have to come through with no help from Tolbert, and Meachum and Floyd will have to step up. If the rumor Gates on fire and poised to reclaim his spot as the elite TE then yeah they could be really dangerous.
Don't think a whole lot of the pass rush or run defense though. They have some nice situational pass rushers but no guys like Doom or Miller.