I've only played DPS in PvP and even that not that much, but I wouldn't say TSW fits badly for PvP. The combat isn't bad and if you're okay with the general mechanics (which aren't atrocious), you won't find it weird. I wouldn't say you're locked into more specs than you're locked in PvE eather, though they naturally differ from each other. Of course there are general issues with PvP, some of which are TSW specific and then there are those that can be found in every game, like premade groups dominate the instanced PvP etc., but generally I've found the PvP pretty fun. Also yes you'll get killed easily by experienced players, but it's mostly because they're better than you, as there is scaling in that sense that people with the best gear won't have that sizable advantage.