DRK definitely needs some adjustments and fixes, but it isn't as horrendous as many on the forums portray it to be.
I personally feel a lot of the hate, particularly the "it's braindead" rallying cry, is due to the changes altering and in some instances getting rid of certain strategies and play-styles and pushing the job in a slightly different direction.
DRK will definitely feel incomplete though until you get Bloodspiller (lvl68) and The Blackest Night (lvl70) as the kit seems to be designed around the usage of those two abilities and will feel lacking without them.
If you like the style and feel of the class, play it and enjoy yourself. While it may have some issues and may not currently perform as well as PLD, remember these two things: balance is fluid and things change, and that those who browbeat a player for choosing a supposedly "inferior" job are often bad players themselves who want to be paired with the "op" job so they can put in less effort.
In the end, a good player of a slightly less powerful job that tries their best will always be better than a bad player of the job du jour who expects the job to make up for their shortcomings and lack of effort.
Play what you enjoy and enjoy playing it to its fullest.