Okay to see if you like walks in massive parks but I wouldn't go there again. I'd rather go to the piazzale Michelangelo and the gardens next to it again.
I mainly went to Boboli gardens see the Buontalenti's Grotto that is mentioned in Dan Brown book but it was quite a disappointment. At the moment you can't even enter the grotto itself, but from looking through the gate it's not really worth it. The statues are not in the best shape, very deteriorated look... The Vassari's corridor is currently under reconstruction so that also spoiled the look. The view from the Gentleman's pavilion was very nice, but the Pavilion itself is an abandoned building with paint faded, shutters closed...
I read the other reviews on here and was unsure what to expect. I'm glad I didn't pay the full 'summer' pricetag for this as I don't think it's worth it at all. I got the 18€ cumulative ticket that included Uffizi, Pitti palace and these gardens so was ok (this is the winter price for admission)