I tried re-learning Haudenosaunee last week, and found some of their major civ features to be really awkward. Namely, longhouses and travois.
The civ would feel a lot smoother if travois options were a bit more balanced in terms of opportunity cost. The biggest issue IMO is that longhouses feel really bad to build w/ travois when you could build a 250w warhut, a 200w corral, or a 400w farm. So, it would be nice to see longhouses with increased size (longer?), HP, cost, and pop. 200 wood houses that provide 24 population would be in-line with their current wood/pop ratio, but I think longhouses could use a buff. 220 wood longhouses that provide 30 pop would be my suggestion.