As it currently stands, WD are basically bottlenecked into using Zombie Bears and Acid Cloud to clear mobs. As these skills cost a large proportion of our mana pool, it is basically impossible to keep up for very long with dedicated gear and using a variety of different mana passives.
This is a fundamentally flawed system. Even with dedicated gear and passives, keeping up Bears and reliably spamming Acid Cloud can still leave us completely out of mana. The only times where I've felt like I've had infinite mana was when I get an Empowerment Shrine which boosts our mana regen to pretty much impossible to get levels.
The other classes do not have, at least to my knowledge, this problem. Many of the top end barbs do not need a full set of IK to manage their Fury. The same can be said for DH and Monks.
The only other class that I see has a similar problem is CM wizards as they also have to purchase dedicated gear in order to farm efficiently. The difference between us and wizards though is that they can get away with it for a hell of a lot cheaper. On diablofans right now, there is a 50m budget CM wizard guide. An ENTIRE CM set for 50m when you can expect to pay that much for an item with an affix -10 mana per zombie charger. Yes they have the same problem, but they can get away with it far better then a WD.
Another fundamentally flawed system of the WD is our badly designed primaries. Whereas the other classes use their primaries to generate resources, only a select few of our runes give us that ability and do it incredibly poorly as well. The damage they do is also completely mediocre compared to the other classes and is disturbing as to why we haven't gotten a buff to these skills at all. This makes primaries in general VERY unappealing and is really not surprising to see them not being used unless someone has vision quest equipped.
Take Bash for example. Each bash is 165% weapon damage and generates resource for them regardless of what rune they use. All of our primaries don't even come close to that much damage unless we have a rune specifically for damage and even IF we choose damage, we don't generate any mana. Vision Quest does answer this problem, however we should not be forced to use it just to make primaries what they SHOULD ALREADY BE, that is, resource generators.
So to summarize:
- Mana Regen isn't the problem. We are bottlenecked into using Bears and Acid Cloud, both very high mana costing skills just to farm efficiently on higher MP.
- In order to efficiently use these skills we have to excessively (compared to other classes) gear our WD to try and sustain our mana, still often failing to do so unless we spend significantly more than other classes.
- Our poorly designed primaries which do not regenerate mana unless we specifically rune them to do so. Their poor damage also makes them incredibly unappealing to use unless we specifically use Vision Quest to counteract the said problem.