I'm not sure it's hate.
What I'm feeling is drive prices are getting ridiculously low - 4TB for $120. (Old dude here: my first hard drive was 20 megabytes for $600.)
With storage prices that low, mirrors are really appealing. Four drives in a mirrored stripe have twice the performance of RAIDZ2 with the same amount of available space.
I also see FreeNAS as being easier to expand using mirrors. In the above example, I can go from 8TB to 12TB in the same pool just by adding a pair of 4TB drives. (Though, with six drives, RAIDZ2 looks a lot more appealing; in a home or small office environment, space is usually more important than performance.)
{shurg}
Cheers,
Matt