Can you randomly find items, and if so, are these items classified as in Diablo II (Rare, Unique, etc.)?

Defeated monsters do drop treasure that characters can loot, but these items are drawn randomly from a specific item class for that monster type. World of Warcraft does not have the same number of random items as the Diablo series, but it does have a lot. And quite a number of these items are rare or even unique.

How does the drop system compare between World of Warcraft and Diablo II?

Like Diablo II, World of Warcraft supports a form of random item generation. Unique items, such as "Sword of Lifestealing" or "Breastplate of Stamina," are created by the system. The game takes the base item, such as a sword, and randomly combines it with a modifier, such as lifestealing.

Are there ranged weapons? Can Dwarves use guns?

Yes. Different classes can use a variety of ranged weapons, such as bows, crossbows, and yes, even Dwarven muskets.

Besides bows and rifles, what other types of ranged weapons are in the game?

Throwing axes, throwing daggers, wands, and crossbows to name a few.

Can some items only be used or worn by specific classes?
 
Yes.

Can all characters use all weapons?

No.

Can you add cool effects and glows to your weapons in World of Warcraft to make them appear like the Hero weapons in Warcraft III: Reign of Chaos?

Yes. There are many ways to modify your weapons, which in turn changes the way your weapon appears. As an example, you can add a fire enchantment to your weapon that makes it glow red and deal bonus fire damage.

Is there alcohol in World of Warcraft?

Yes. Alcohol causes some temporary effects, such as slurred speech, to those that overindulge.

Are there items available to allow characters (other than Undead) to breathe underwater for durations to exceed 90 seconds?
Yes. Certain potions, quest items, and crafted items can help you breathe underwater, as can some class spells.

Are there ways to modify your characters vision with items?

Yes. As an example, engineers can make spy glasses that allow your character to see farther.

Which is better? Quest loot or crafted items?

The development team worked very hard to balance the two classes of items. There are many good items in both categories, and you might find that one type is better than the other at different stages in your adventuring career. For example, at level five, your "best boots might have come from a quest while your "best" gloves might be crafted. At level twelve, this situation might be reversed as your "best" boots are now crafted ones and your "best" gloves are a quest item.

Are items crafted in World of Warcraft more useful to other players than crafted items typically are in other RPGs?

Throughout a players career as a crafter, there are certain items that he or she can create which will be the best items at that level. For example, at level 40, the best bracers might come from a player with the blacksmith trade skill, while at level 45, the best bracers might be from a quest. There are also a number of consumable items that can be created by players with trade skills, such as armor patches and sharpening stones. These consumable items can be sold to other players, who can use them to improve their existing armor and items.

Can players use crafting professions to recreate the same item over and over as long as they get the right materials?
Yes.

How does the trading interface work?

You must be side-by-side with another player to trade. The interface is designed to be as secure as possible. A similar interface is used to provide a secure system for enchanting and unlocking boxes and so on. This prevents you from having to actually hand over your items to the enchanter, whom you might not fully trust. In World of Warcraft, the enchanter doesnt have to have physical possession of your item to enchant it.