The biggest issue with longhouses (IMHO) is that you have to actually *work the tile*... I think a lot of people (myself included) sometimes forget that. You look at a building like a stable, or stoneworks, and you see +1hammer from horses or whatever, and you think, "hey, this building is +2 production for 1 gold maintenance. That's a good deal, I'll build it!"
In reality though, it's a big compromise, because you're sacrificing growth to work 1food tiles, and whenever you aren't working those 1food tiles, the production bonus drops to the base +2, making it unquestionably inferior. It's the same thing with that stable. That 1g maintenance is all for nothing if you're focusing on growth, because you're not working that 1food3hammer horses tile.
In a game where technology rules, growth is everything. And if you're ignoring technology to focus on early warmongering, then longhouses only become relevant if you're warmongering inefficiently. By definition, UBs that are only relevant when you're playing inefficiently are themselves irrelevant. (In my opinion... and since I'm obsessed with min/maxing, take my comments with a grain of salt)
Unfortunately, this judgment applies to *most* UBs, UAs and UUs. The game balance is horribly off. The optimal path takes you far away from most of the things the designers put into the game:
Domination? Game's over before half the UU's are even accessible.
Culture? Sorry Pedro, the game's over before your ability becomes relevant.
Diplomacy? The game isn't won by leveraging your civ's CS-related advantages. It's won by out-teching the opposition.
This is why I started making a mod. I'm sick of having to choose between playing smart and actually using a civ's uniques.
So, this ranking system is quite relevant, and in the current state of things, Hiawatha is a slightly worse than neutral civ. But, to be fair to the original point Klesko was addressing... it wasn't always this way. Hiawatha *shouldn't* be useless. And if the game was more balanced, he wouldn't be. I certainly intend to address this in my mod. But, that's neither here nor there. Back to the rankings.