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1. Darkness Falls type dungeon: Darkness Falls was a great success in DAoC. The dungeon was intertwined with PvP and PvE. If your faction had most of the keeps, you could enter, via a portal in your homelands. But, if you lose that access, and are in Darkness Falls, you better be prepared for battle. Because the new winning faction now has control, and the first thing they will do is try to clear the place out of all enemies. As far as ESO is concerned, the dungeon would sit within Cyrodiil, and there would be an entrance portal in each PvE zone. If you control Cyrodiil, your portal opens.
2. Hidden caves, underwater caverns, out of the way secret areas: Guild Wars 2 got this right. As an explorer type gamer, I had a blast finding every little hidden nook, cave, secret area that GW2 had provided for their game. It added so much more the the game, not only offering challenging jumping puzzles, it gave you a sense of accomplishment upon finishing each jumping puzzle and getting not only a nice, big treasure chest at the end, but an achievement.
3. Housing : Please, for the love of GOD, do not give us that instanced room that all the new MMORPG game developers are trying to pass off as housing. It is lazy and boring. Yet again, DAoC got this one right too. Yes, the housing area was instanced. But once you entered the housing area, you had a neighborhood of homes, where you could move in next to your friends and guildmates. The homes were able to be customized and furnished. You could even hang the heads of the major bosses you killed upon your walls. Talk about immersive. On top of that, you had the choice of purchasing a vendor outside of your home, where you could sell your goods. It was a great way to kill two birds with one stone. You had a housing area and an auction house in one area.
4. More Lootable items: One of the main complaints I have seen from the true Elder Scrolls fans in the forums, is the lack of lootable items. As I play the game, I run across books, weapons, armor, food, etc... But only some of that is lootable. That was a big mistake. In my opinion, either make it all lootable, or get rid of the non lootable items. I do not mean being able to pick up every book on a bookshelf. I am talking about having the same system as we saw in Skyrim. Little things like this can truly turn off a true fan of a game. It may sound petty, but those who play Elder Scrolls games for the true RPG immersion factor, are being short changed. Also, add some lootables in the caves and dungeons. Add some treasure chests too. A dungeon/cave is supposed to have hidden troves of loot. The ones in ESO are very bland.
5. Thieves Guild and Dark Brotherhood: I know that Zenimax said that these guilds will be added to the game, but this is a must. These guilds were the most popular ones in skyrim. Plus, they are such a huge part of the lore of this game. Going back to the Elder Scrolls fans, it would have been smarter for Zenimax to have added this content to the game before going live. Those that say ESO lacks the true lore and gameplay of Elder Scrolls games, could have been swayed with more of it added to the game from the start.
In my opinion, if Zenimax adds this content to Elder Scrolls Online, I believe that this game will be the best MMORPG on the market, if not, ever. By taking great content from other games, and implementing it into ESO, it is a recipe for success. Today's gamers demand a lot of content in an MMORPG, especially one with a monthly subscription. End game dungeons and raids get old fast. So does questing, once you have been there and done that on other alts. So, it is the game developers job to have many different types of content to keep us entertained past level cap.