Is this 'Reason' just slightly modified Ocaml to look a bit more like JavaScript? I don't get it.

Yes. Facebook decided to make an alternative syntax for OCaml for JavaScript users. Personally, I can't get behind it because it seems to be fragmenting OCaml (this article references OCaml in the title, but doesn't apply to actual OCaml code, making finding actual documentation much more difficult). At the same time, it seems like wasted effort when most of the process of adapting to OCaml involves learning the semantics and paradigm rather than the syntax.

seems like a more verbose ocaml for the javascript generation

Yes, it had but that bug was fixed like 10 years ago. Stop spreading FUD.

Possibly fixed. I've had one incident of an XFS filesystem refuse to mount after it replayed the journal after a power outage. xfs_repair worked but I shouldn't have to piss around in single user mode in 2015.

Kit was a HP DL380p, SmartArray 420i SAS array, CentOS 7 about 3 months ago.

Outage caused by a large UPS explosion that took out 100 machines. No NTFS or ext3/4 trouble at all.