I hope this doesn't come across the wrong way, and anyone feel free to correct me if you feel I'm in the wrong but.
In terms of PVE content the game is a little bit lacking (the asian regions have a lot more content PVE wise than we have seen in alpha). For us right now there are only a few end-game dungeons, the replay value of them comes from the fact that loot is bid based so you'll have to do them a few times to get your weapon upgrades and bopae or any outfits you want to Buy Blade And Soul Gold. There is additional replay in the fact that there are harder versions of the dungeons to do with smaller groups.
If you're really completely not a PVP guy your mileage may not be what it would be for a game like FFXIV for example.
As far as I'm aware there aren't any raids outside of grouping for fieldbosses.
Every class has potential in PVE, KFM can spec into taunts and have fantastic block and good damage output to be a fantastic all-around character. Assassins have incredible single target DPS, Summoners have great utility and solo capability (although all classes can solo) and so on.
It's my personal opinion that the PVP is an integral part of this game and without it, there may not be a whole lot to keep you occupied, but that's just my opinion and I'm sure there are plenty of contrasting opinions out there.