For me, the thing I got from Revelations was a sense of disappointment, that was when I realized that the series is supposed to be a cash cow ranch instead of action-adventure in well-researched(*) historical locales.
I advise you to skip Revelations and go straight to 3, because I think that AC:R spoiling the series for me is primarily responsible for me turning AC3 off 3 hours in and failing to work up the mood to go back.
(*)By "well-researched" I mean that on a scale of 1-10, where "1" is a lazy cliche storm and "10" is perfectly mirroring the state of knowledge at the time of writing, it ranks at about 3. Most works of fiction are 1-2.