Although the 840 Series is clearly in worse shape than the competition, these results need to be put into context. 500TB works out to 140GB of writes per day for 10 years. That's an insane amount even for power users, and it far exceeds the endurance specifications of our candidates.
Seems like it's not as bad as you make it out, I don't think i'd be using a 'puny' 250gb drive in 10yrs much like I don't use 250gb HDDs now that drives over 1TB are around. 1TB SSDs are already around the $500 mark and after ~5 yrs I think they'll be quite affordable.