0-simplicity: remove borrowed power. class power comes from spec/talents/gear and gear sets
1-bring back 10/20 man normal /heroic. no mythic, its baked in heroic. no-lfr. raid normal is flex. heroic is fixed 10 or 20 man.
2-heroic raid not accessible unless you clear the raid in normal.
3- AOE cap: remove it. put back what classes had.
4-remove wow token permanently
5-actively remove boosting
6-put back guilds benefits
7-gold challenge modes
8-reforging
9-raid gear sets
10-dial down the number of mounts.
11-bring back exclusivity: you get stuff when the xpac is current, after its gone forever, you get a recolor of mounts etc.
12-stop putting restriction on toys. some toys only work in x zone, x lvl. remove that restriction unless it breaks the game or world pvp.
13-fire anyone that want to bring systems upon systems.
14-stay the f..k clear from bringing diablo shit design to an mmo.
15-bring back old hunter survival spec.
16-design bosses that do not disadvantage melee.
17-spread buff love around or put it back in professions consumables.
18-legendaries: one per xpack that we slowly upgrade with patches. not 20.
19-remove articial walls like limited currency per week. if someone want to go crazy farming, he/she can.
20-meaningful reputation rewards, it is silly that by the time we hit exalted all rewards are pretty useless when it comes to gear.
I could go on and on and on.