AC: Brotherhood and AC: Revelations were pumped out in that time. However, AC I had 4 years; AC II had over 2 years with a 450 member team (twice the size of XIII's team); and AC III had about the same or bigger along with around 3 years of development time; and AC IV is rumored to have about 1,000 people across 7 different companies working on it.
AC: Brotherhood and AC: Revelations were clearly inbetween games made to finish up a plot line. They both had reused assets, a combat system they were tweaking at that point, lower production values, a much smaller production time, etc. AC I, II, III, and IV are clearly full AAA games with the full weight of the company behind it.
LR is being pumped out with only 14 months of full development (I'm being nice and assuming they'll be working all the way up to the end of October, though realistically only finishing touches will be made at that point), most of Lightning's animations seemed to have been reused from XIII (minor tweaks here or there not withstanding), we get to use only one character for a battle system meant for 3 characters at a time (and we went from 50 to 80 abilities along with Eidolons across six characters down to 12 abilities with one character . Even Dirge of Cerberus had enough common sense to not use VII's combat system sans everyone but Vincent!), the game will be the shortest of the trilogy (even if each day is 2 hours long, that's only 26 hours. XIII-2 was advertised as having a 30 to 40 hour main story and XIII was advertised as having a 50 to 60 hour main story), there are clear attempts to pad the game as much as possible, the visuals are clearly below that of XIII-2, and so on.
Look, maybe E3 will blow us all away. But for right now, LR has all the hallmarks of a rushed product. I want this to be a good game, but all I see is a train wreck. It's SE's job to impress, not mine to be impressed with whatever they throw at us.