Have seen quite a lot of negativity about the Love Garden both on the forum and in chat so thought I would say why I think it is great:
I was lucky enough to get 2; so I used a similar principle to the Xmas market and built one in front of my mayor's house and moved 20 residences around it, the 2nd one I tucked away in a corner and am ignoring.
As the 2 gardens share a cool-down there is only a limited time that you can have both running so I only use the one (sacrifice the 300% population boost for 25 residences - I don't really need this); so I use the one every 12 hours - this also fits in with my play style as I tend to pop on in the morning before work and then play for 2 - 3 hours in an evening.
This means all my schools are permanently running as if they had Hot Lemon Tea buffs, this has significantly reduced my need for bread as I no longer need to make settlers in the provision house; so I was able to knock down some bakeries/mills and reduce my need for wheat & water - freeing off several building slots; may even demolish a school or 3.
Combined with the Xmas market (running in the same fashion) buffing my important production I have been able to free off over 30 building licences since the end of the Xmas event which has meant I have loads of space to experiment with the new buildings (please fix the Observatory)
I now have a significantly increased population growth and weapon production rate which means I can make more troops; do more adventures and get more XP and magic beans which then means I can do more of the beanstalk mini-quests all of which reward barracks buffs so I make my troops even faster!
Have also seen some people say that it is more useful for lower level players - well I agree that it is a great building to have when you are in that period where it is a struggle to produce population; but I also think it is great for higher levels (I hit 71 during the event)
So definitely loving my Love Garden