Well, if your not into crafting and not interested in Diplomacy thats 2 out of 3 spheres of Vangaurds gameplay (adventuring/crafting/diplo) then yes, youll probably lose interest if you get frustrated with adventuring.
Diplomacy itself has actually never been broken, its the first part of the diplomacy tutorial thats broken and untill the next patch a GM has to help you with the first part. Looks bad aye, but as I just started diplo myself recently and had to go through this myself the GM told me itll be fixed in the next update. Diplomacy is actually a card game thats a lot of fun, reminds me of the card game in FF8 (I think it was 8..). VG uses Diplomacy as its main source of Lore, you learn of the stories of the lands of Telon, going to each city to diplo with all the different races governments and whatnot. Im lvl 15 now and its been quite interesting, but its not everyones cup of tea... more for someone who would like to play cards or read a book then someone whos just logged on for some hack-n-slash.
The great thing about Vangaurd that most people overlook, because almost all people want to rush to the endgame, is all the mid-level content. Vangaurd is designed so that you cant do all the content with 1 charectar. Theres 3 continents loaded with quests and several areas for every level range. Each city has a missives board, with 12+ repeatable solo missive quests, that you trade in for nice rewards. Its possible to solo to 50, my wife has soloed to 43. She never groups with people shes never met, never joined a guild and she doesnt grind xp a la EQ just does quests and takes her time to enjoy all the areas. Of course, this style of gameplay isnt for everyone.
Evil - I can understand why some dont want to join a guild right away, whether theyre shy or dont want to commit to one until there ready thats quite understandable and I can respect that. However, Id strongly recommend joining a newbie guild when you get started theyd undoubtly be able to help with many of widely known bugs and problems. You would'nt have such a problem finding people to play with, theyd be able to give you advice on where the best spots are for quests, they could tell how to get past the diplo bug hehe j/k. Once your charectar has developed and you know what you want to accomplish in the game, whether its hard core raiding or just a casual experiance, you can leave a newbie guild to join another that more your playstyle. Lots of newbie guilds are happy to have you play with them and value the time they have you at all. Again, I do understand and respect your reasons for not wanting to join a guild but your doing yourself a slight disservice by doing so.
As to the free month this month, I searched the forums and couldnt find evidence posted by sony, but heres several links posted by players... as I understand it, old subscribers got an email saying they could come back this month. Maybe check your email or just go on the live chat help on the SOE site if your interested at all.
Well is the free game play bringing you back? Giving "Return" free Month a try and I have a question Returning players planning to resub after free month?
In closing, Im not saying that anyone should cancell theyre WoW or AoC accounts to come play Vangaurd quite the opposite in fact. I wouldnt return until game update 6 which is mid-august, when another batch of the major bugs will be worked out. I just saying when its free, hit it up, its free till the end of july and I pretty sure itll be free for another month after Isle of Dawn comes out. Vanguard is not dead!! And still has potential, youll see