Was thinking about melee summoner, if you take a Howa guardian build, which is already a pretty decent thing, drop some crit chance/damage nodes and add some minions to it, use dom blow as your main attack, you can get some pretty decent build going.
Shit's horrible as a starter build though, since as usual with howa builds you need a billion uniques and the few rares have to be rolled pretty well to compensate for resists(I'm using purity of elements in my test build with an enlighten 2 as a base, but with enlighten 4 you can fit in vaal haste instead but you need stupidly rolled rares and like lvl 97 to cap all resists which is a bit of an issue). But basically it has decent survivability with CI+incandescent for ele damage, has a good ES base from the various uniques, high int and guardian reserved mana > ES, does good damage with Howa that you can leech a bit from(although I haven't really found a good way to roll leech on the gear, maybe warlord's mark ring or blood rage) and then it still has dom blow+herald of purity minions, I also slapped zombies and AG in a basic 3 links for more meat and AG for some buffs. The minions should add a fair amount of damage to the build.
But yeah still not convinced by this stuff. Also not sure how good that "Crusade slam" will be. If it's not fucking tits, I think melee necro is still going to be better than melee summon guardian.