I've owned several Seagate HDD's and haven't had many problems. I've had failures, but the replacement process was fast and painless.
But I think why we're all poking at Seagate right now might be due to the fact that their reliability has kind of tanked over the last several years. While I know you can't totally read or believe all the reviews out there, it does kind of say something when the majority of the reviews are only putting the product at 50 to 75%. Now their making a bid/push to reinvent/reinvigorate their image again.
And Seagate purchased the Samsung HDD division in 2011. Which is about the time they relabled, rebranded and saw reliability start dropping. Coincidence?