Hi here are some of my feedbacks in playing the game.
Started playing on 2nd iCBT. I haven’t explored the whole game yet. I have a level 58 Barb and level 30 Pyro.
1. Make the party-ing rewarding.
-Make joining a party a multiplier for gaining EXP. Through this, we will be able to encourage more party-ing and amplify one of the foundations of MMORPG - which is RPG/socializing/teamwork.
-Grinding will be less stress and more fun because it will be interactive. (human interaction)
-Got the IDEA from RO2. More members in a party more exp.
2. MAILBOX
-Don’t need to explain this.
3. Harder Boss fights during solo quests.
-At least make us utilize the jump/potions/kiting/CCs etc, More strategic more fun and less dull.
-I can tank a boss and kill it less than a minute (im talking about level 58 and below boss fights during quest)
4. PVP Variations/Brackets and Guild Wars
-I know there are topics like this. Just want to add to the “emphasis” 
-Brackets like level 31-40, Level 41-50 etc. (I am referencing RO1. I have a capped character and I have characters for each bracket just for fun :D)
5. INCREASE equipment durability.
-I am level 58 grinding at Tenent Chapel 1F. My EQs get wrecked just after 20mins of grinding.
-It’s kinda annoying to go back to town every after 20-30mins. :3
6. ALLOW US to tweak the CONTROLS IN-GAME.
-Unbinding/Rebinding of buttons/keys.
7. AOE Marker (I dont know what to call it.)
-I am takling about a “mark” or “something” that tells us where our skills will HIT.
-I am still not sure on how it will work since all skills that ive tried are “instacast”.
-Though I can get used to it and try to estimate where/what my skills will land when I cast it. It’s just a personal preference having a “mark”. Though thinking about it now, it will be useless since it’s intacast. 
8. GREAT GAME
-I love the graphics. Just need more optimization that doesn’t require tweaking the .xml file.
-I am from SEA. FPS drops on crowded places. 300+ ping. But still playable. Experienced some delays but haven’t died yet because of that. Hope there will be a SEA server.
-I love the simplicity of casting spells/skills the knock ups, stuns, knock backs, hack and slash. really RO feels :3
-LOVE the game pad option 
and actually all the control options.
-I love the insta-back to quest master to complete the quest.
-I love exp and drop rates. I don’t know if it is the “normal” rates. But for personal preference, it feels right for me. Not too fast, not too slow. (Maybe on higher levels it will be different :p)
-Auto-loot is the best. No spam clicking on the ground
That’s it for now. If I mentioned something that is already addressed/raised up/resolved or known by many and is a concern for many or makes me look like a noob, my apologies. Just adding to the emphasis!