Off the top of my head
Market problems:
1.1 All aquafarm produce: too low supply
Solution: Increase yield
1.2 Earthglow Lunarite: Availability, required demand 13x50 per character
Solution: Add to same sources as other lunarites
1.3 Misagon's Crystal: Availability limited with dailies, required demand insane
Solution: Reduce price, or increase daily prestige gain
1.4 Cryptic Lucky Scroll: Source, demand volume varies but is high
Solution: Re-introduce crafting recipe that used to be
1.5 Serendipity Stones: Source, demand volume insane
Solution: Additional sources, possibly crafting like Cryptics was
1.6 Book of Auroria: Sources, demand volume insane in comparison to sources
Solution: Increase droprate or add more sources
1.7 Charcoal: with 5.0 trade pack system, market will be completely ruined, major serverwide bottleneck to crafting, this happened even in multi-server auction house enviroments
Solution: Increase gain accordingly, or reduce use accordingly, if 3.0 system is never again possible to restore
5.0 Questions / Problems:
2.1 Auto-loot Powerstone: Availability?
2.2 Nation Removal: Why? Our server doesnt suffer from public oppression from nation, but i can guarantee if you push everyone to pirate / west / east, it will result in oppression.
2.3 Exile System: Controlled or free to swap?
2.4 Pirates: Slots? Slot abuse protection?
2.5 Hiram t3 stronger then epic erenor: Hiram too strong until 5.5 fixes erenor
Solution: keep Hiram from being tempered
2.6 Ayanad: Redundant, 5.3 lunafrosts dont help this at all
Solution: Buff stats or set bonuses, or make crafting cheaper to allow for more flexible erenor crafting
2.7 Boss Items: 4 out of 5 + 5 + 8 are usable, everything else is trash.
Solution: Buff to higher level ranges, maybe 3rd level upgrade.
2.8 Boss Materials: All boss materials become inventory space trash.
Solution: in 6.0 these materials are added to boss synthesis system, maybe introduce custom change similar to this.
Simplest way to do this would be to convert these items in difficulty related volumes to meaningless boss item like Kraken Necklace that is considered synthesis trash item anyway.
Custom Problems:
We have alot of customs titles and old buffs available.
Titles are too strong, but i think its too late to do anything about them and they alone arent gamebreaking.
Most of the old% buffs were removed from the game originally because they are too strong. % makes the strong stronger, but doesnt do anything for the weak.
Most of these buffs are behind public daily content now too, which makes strong oppress the weak to get them.
This also adds more "dailies" on top of dailies that you dont even want to do unless you are new or weak.
As for the titles, alot of the "Titan" titles have faulty stats in them. Most of the stats are correct but the values are not.
For example: 40 armor penetration is a meaningless amount, worth less then bad gems. I can even do a full sweep of the stats to list for this to be fixed.
"Dragon Festival" titles were good! just abit weaker then the meta Titan titles