A complete downgrade of Diablo 2, broken gameplay and elements lay a long path of patches to fix.
Diablo 3 Version 1.0.3
Pros:
Great visual makes this game extremely appealing, both the in game graphic and CG cinematic are at high standard.
Auction Houses allow players to buy and sell with ease.
Interesting characters design and play styles, especially the witch doctor.
Loots is yours so no fighting for drops.
Cons:
Uninteresting storyline, if you follow the Diablo Lore you will automatically know most of the bosses you will encounter.
Ending deliberately setup for an expansion, the game ends with one of the culprit alive somewhere, it is a no brainer there will be an expansion and he/she will be there. (possibly as a boss)
Broken game mode inferno, LOTS of deaths, and tedious battle with unique mobs. Unique or Champion mobs have sets of affix which determines their powers. With 4 sets of randomly chosen affixes, with poor luck you can face a mob that is nearly impossible to defeat.
Broken item drop and item stats, item drops are 99% garbage and 1% is worth something. Stats are also randomly rolled which can result in weaker unique item them magic item. Some legendary items are complete jokes with horrible stats.
Dying player population, constantly having trouble finding people to play with because most people already have 1-2 characters at level 60, and it is already expensive to gear a character for inferno.
No ruins word or customizable skill trees ( the reason why I replay Diablo 2 and have so many character with different builds).
There is no reason to create 2 character of the same classes because all skills are unlock and only items affect your stats. Don't know why blizzard put in achievement for having each of the classes to be level 60 twice.
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Summary:
I brought the collector edition because of the art and the soundtrack, the game gave me 30 hours of fun and about 100+ hours of pain of grinding gears and dying to get what I need.
I have every character except wizard at level 60, to be honest, the campaign is boring. Only dungeon is randomly generated and most places are static maps. Act 2 is my least favorite and Act 3 is my favorite.
Now I stop playing because there is nothing for me to do except to magic find, but the chance to get good gear is so low I rather play other games instead.