Comment by ImCEOBitch

I used to love OpenBSD but I've had to abandon it:

- no sendfile implementation to accelerate web servers

- ancient userland pthread implementation

- worst SMP implementation of any mainstream OS

- no unified buffer cache

- no working TRIM support

- no 802.11n support

- video card drivers aging, ~3 years behind mainstream

- no adobe flash support / hackarounds

The only thing I really miss is PF.