I started playing City of Steam: Arkadia mostly due to the fact that it was a Steampunk based MMORPG with the fantasy touch that I enjoy added in. The story at the start was interesting and easy to follow, and it held my interest long enough for me to get to level 20 something as one character - which depending on the MMO you play can range from super easy to down right difficult.
Now, let's get down to the nitty gritty...
* Steampunk, Steampunk everywhere. Glorious top hats, goggles, corsets, and a Steambike!
* The Story - It has a story, I'll give it that, and one that's actually interesting enough to keep me curious about the next chapter.
* Easy-to-get Costume Items - While they do give some perks, via set bonuses or on their own - they are easy to get with daily log on and your 5 free lesser items and your 1 free better item, and if you keep opening those, you eventually can open more boxes to get a chance at the rare set.
* Different Battle Options for Classes. I like this, but at the same time it doesn't really do much when half of your ability to kill things depends on your gear that you're actively using.
* Mercenaries. A good idea, pretty nice at low level.
* Graphics - They're not all that great, but considering it's a Free MMO, there's not too much you can do [aside from maybe polishing it up, I guess?]
* Music/sounds - Music makes a lot of the game for me, and if I have to turn off all sounds just so the game is remotely bareable, then that's a huge issue.
* Auto-Battle - While this could be a good thing, it's not. You can set yourself to AFK level and get through things [if you're high enough of a level and item-set] and never talk to anyone in the game ever. If that's your thing, go ahead.
* The amount of difficulty ramps up /quickly/. I'm all for a hard game, but when you have an auto-battle system in place, you're pretty much saying "Press button to win" and if you're not paying complete attention to how your gear is set up and when you're using potions, you will die pretty fast, even with things being done for you. The dungeons and other areas aren't marked off by level restrictions like most other games, but by item restrictions. If you don't meet them, even by a mere 20 points, you will be killed off.
* Limited Character Customization. This one is self explanitory, but even WoW has more customization in comparison to this game.
* Pay-to-Win - Like I stated about difficulty, it ramps up hard if your gear doesn't meet the requirements. Funny thing - If I remember right, Costumes add to that. You can buy really good costume armor and weapons and just glide your way through a good chunk of the game. This also includes Bike skins, pets that also give you stats, as well as mercenaries that can wreck things.
* Mercenaries - These guys can make or break you too, as /they/ are also figured into your relative ability to kill things fast so you don't die, even as a tank class.
In short - Play at your own risk, this game has more Cons than Pros.