I think the problem people have with Standard Bearer is that is is situational and it only works well with swarm builds. If you can use it correctly it can be very powerful, but when I played Warlord I never got around to using it much.
Barracks is a spawnpoint, so whether you like it or not really seems to depend on whether you even like spawnpoints in the first place. I personally don't like spawnpoints because they are basically a huge lump sum tax on your mana that may not pay off. Also, as far as spawnpoints go, Barracks is nowhere near as good as the Wizard's spawnpoint and the BM's spawnpoint. Sure, you can pump it up to generate a lot of mana, but that requires harmonize + 2 outposts. That is a pretty significant investment. The drawback to making such a huge investment is having your barracks destroyed. Once that happens, it can be difficult to recover.
I don't hate the War Sledge like some people do, but the Horn of Gothos syncs better with the rest of the Warlord's abilities. War Sledge would be great if the Warlord was built for doing everything himself, but he isn't geared towards this at all; if you look at all of his special abilities/attributes, they have to deal with his creatures. I am crossing my fingers for a future Warlord that has abilities/attributes based around soloing. Then War Sledge could be a deadly tool. Basically, War Sledge is a fine weapon on its own, it just doesn't mesh well with what being a Warlord is all about.
I have played Akiro's Hammer maybe 4-5 times in the past. I have regretted bringing it out EVERY single time. It is slow, easy to destroy, only good against conjurations, and there is no good way to fix it. You bring it out, maybe it gets one attack, and then it gets destroyed. Or, if your enemy is smart, they completely ignore your Akiro's Hammer and think to themselves, "I'm sure glad he didn't spend all that mana on a creature!" I hope that, in the future, we have war machine conjurations that are a little quicker, less situational, and less costly. I am also hoping we get something better than Goblin Builder, my vote for worst creature in the game!