qaccy
Emperor
Two bad effects. 5 goods in 6 squares is pathetic (and the same as probably the least popular train car). and the defense is only worth a little more than 1 square. Free crap is still crap. Just antique dealer fodder.
The 2 FP train car was the only one remotely desirable - and that was at least in part because of interaction with the blue galaxy doubling. 5 goods wasn't enough on the train car to be worth adding for blue galaxy effect (15 goods from a sleigh builder undoubled is better than a chance of doubling 5) and it's not enough here. 5% defense for attacking army meanwhile isn't worth much at all (1.25 squares of sentinel outpost).
Not considering the availability here though. Sentinel Outposts have to be chosen to go after during events (which are time-limited), and at the expense of other prizes for those on a budget. This building doesn't have to be chosen; it's basically a free prize for participating. Players in diamond/platinum leagues will be getting them without having to use up event currency nor hoping to get lucky enough to win one.
If this was, for example, a choice between getting fragments for the SoH or fragments for this Road, sure, this building's less appealing. But since it's not a choice and doesn't require any extra effort to acquire, I still say it's fine as-is. The addition of this building, at the very least, means we're getting more stuff for doing the same things we're already doing!