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From all that I've read and seen of this game, it seems like it'll do what it promises: being the best, if not one of the best, f2p games out there. The game itself is a conglomeration of many popular mmorpgs today, and has taken the best, if not the most differentiating features from all of them, and due to that I believe it will be a very successful game. What, in my opinion it has borrowed:
Dual Class System - FFXI
Castle Seiges - L2
Housing - EQ2, FFXI, Ultima Online
Arena/Battlegrounds - WoW
Tons upon Tons of quests - WoW
Dye-able armors - GW
Auction House - FFXI, L2, EQ2, WoW
In Depth Character Customization - CoX
These are some of the key features that I can think of off the top of my head, but the list surely goes on. These features have made the aforementioned games very popular, and I think will do nicely in one setting.
Many of these, with an exception of WoW (and CoX soon), do not run native on Mac or Linux, and require either crossover, which doesn't do such a hot job of running games (from my experience), or bootcamp, which is only an option if you happen to have an unused copy of windows laying around. Now, I just so happen to have bootcamp running on my mac, and will be able to access the game via my windows partition, but what about people that can't do such a thing?
In reading many of the previews of the game, and interviews with the developers, they mentioned that they'd like their game to be above the rest, a "triple A" game. Many of the features within the game, as I've mentioned above, are great features, but if you do a little digging, many have not originated in this game. While I do believe that having all of these features together in one place will help set RoM apart from the competition, I feel that something that would really set the game apart from the others is having a native Mac and Linux version.
The only two mmorpgs that I know of that have native Mac and Linux version are WoW and EVE online. While this is a great thing, having two mainstream mmos available to the mac, many other companies haven't followed this route, although I believe that developing for not just windows users, but all computers users is a very sensible business plan. While maybe not economically viable for the developers at first, I think that this is something that should really be looked into. You want to set this game apart from the rest developers? Taking the best features from all of the games out there, and putting them into one was the first step. The second would be going the extra mile and doing something that most of the p2p mmo developers have yet to do; create a native client for the mac and linux.
EDIT: Maybe I should have posted this in the RoM forum... sorry if it offends anybody that it was posted here, and if the mods feel so incline to move the thread, be my guest.