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1. The quest and grind. Its easier to quest before level 50 in aika, and you can level up really fast. Most of the quest are fun and very engaging. The grind is somethign you have to do after level 51. A year a go when I started it was much harder, but now with mutated mobs which give an extended amout of experience, it's very easy to level up. Which makes for a better game play. Although some characters: clerics, pallys, warriors, and warlocks are easier to level up, than the dual gunner and rifleman.
2. The dungeons. Dungeons are fun and are scaleable to the amount of players that go in. I think this is helpful when your doing quest, but doing a group dungeon also teaches you how to use your class, and thats something you don't learn when you scale.
3 The Nation Wars. The nation wars are my favorite part of the game. I'd suggest starting out early, you might die a lot but you get to meet a whole lot of higher level players and start building up honor for honor clothes. Also, its just really good fun. I've seen all 5 nations going at it in one nation over one relic. Its something I definitely wouldn't want to miss out on.
Overall I think Aika is a good game, you'll either love it or hate it. I personally love it.