Going back to the Valentine's Day reward buildings, mine are already obsolete, and I haven't even had them a month.
I completed the quest in Act 2. My Bridge is producing 420 culture, and the balcony is utter crap. I only put it down to overcome a temporary population crunch I had before I unlocked the advanced residences tech at the beginning of Act 3.
Mysterious Cyclones put both to shame at 440 culture for a 3x3. This is the same size as the bridge, but 20 more culture, so a straight upgrade. The 47 population I got from the Balcony is now trivial considering I'm getting over a hundred extra population each residence I upgrade.
I half-arsed the quest line, mostly because most of it was what I was going to do anyway. And I was correct in assuming that the rewards were useless. Two weeks... that's all it took for them to become completely obsolete.
Oh well, easy come, easy go. I'd have been more upset if the quest caused me to significantly inconvenience myself. As it is? I really can't care any less. It was a complete and resounding 'meh', and a waste of Dev time and effort.