D2 since skills were based on level, you could still do something with no gear, even in PvP you could see a naked bone necro own geared players.
Since D2 was not gear dependent you had much more choice in what gear you wanted to play around with, without sacrificing too much.
D3, you do not have much choice in gear or gear options because your damage is dependent on how much IAS,crit damage, crit chance, and primary stats you can get on your items.
So every one wants the same items with same stats, leaving little room for anything else.
D2 also had caps, IAS cap,FCR cap, FHR cap. So with caps you had to think about what item combinations should I choose to give me X amount of fhr,fcr and ias and so forth. Creating unique item combinations in D2, adding more customization.
With D3 having only a cap on run speed, people again are given little to think about in gear choice as like i said you simply try to keep increasing all the stats on items that gives you more dps.
Loot was also much better in D2, as it was less random then it is in D3.
In d3 you could find a lacuni bracers, but if they do not roll specific stats like crit or res all they garbage.
Also in D2 you had rune words which worked out good. High runes were hard to find, but if you found enough low runs you could fuse them together creating a higher rune, so you always felt 1 step closer to getting some of the best gear in game.
In d3 you mainly have to rely on other people finding the items you want for you, and when they do find them you have to grind forever to get gold to buy them.
And with gold losing its value all the time, with little amount of gold sinks and tons of gold bots items become more expensive to the point where it would take you 2 years to grind enough gold for the items you want, and by the time you grind for the gold the item is all ready gone.
So really there is nothing to grind towards as your items are based on what others find and post in the AH, and you only have 1.5days to try and get billions of gold to buy it.
Thoes are some of the things which I do not like about d3 making it feel less like D2. Thought I share my thoughts about it.