these 2 topics go together, so just read the text.
personally, i loved and hated the loot system in d2. on the good side, when you were playing alone it was easy to grab your loot and move to the next pack of monsters. on the bad side, when you were with 5 other people, they would steal stuff that you obviously needed.
now thats not to say i want a WoW system of looting. it took way too long to loot and the pace was slow. d3 should be sorta a mix of the 2.
SO HERE IT IS - on frequent loots, (like gold, waste armor, potions, etc) it should be like group loot in WoW. thats where everyone takes turn looting(but the loot still drops on the ground) so every other monster that is killed, only YOU can see the armor that flies out of the monsters belly, so only YOU could take those loots. same goes the other way with you party. but on rare, unique, and rune drops, it would be like a need before greed style of looting like in WoW. thats where the item pops up on your screen and you "roll" for the item.
however, in WoW, if you obviously stole an item you didn't need, or ninja-ing, word would spread and people would shun you. the problem with d2 was that there was so many different characters and games, you sometimes never saw the person again. but in WoW, what with major cities and shared towns, you would eventually see that damn ninja again.
so how about towns like in Hellgate? they were crappy and really claustrophobic, but it would be like WoW cities - huge and open. the town would be where you would spawn when you logged in, and then you would open a window and create a game, like battle net. that way you could mingle and interact with people easily.
so in summary, LOOTING SYSTEM - shared with need before greed style.
TOWNS - large cities that everyone spawned in and where you would mingle, interact, and where you would created seperate, private games
Having any type of town that is like WOW would not be a good idea. You can party with 4 its seems in their early build and less is more. Having a town with lots of charactors all decked out in hero costumes takes away from the story and feel of Diablo. Sorry but the child game WOW can have those types of towns. If Diablo 3 has towns maybe you could have a room to store your stuff in and a couple stores with npc's but not a lot of people.
I like the idea that you get your own drops without having someone with a hack pick it or something stealing all the stuff.
Lets face it .....D2 worked pretty good so why change a lot of it. More content and more quests and changing area's so its not boring will help.:O