For me the series is Mass Effect, which has always scored exceptionally high.
On X360 (the platform I first played them on), they're as follows:
ME1: 91
ME2: 96
ME3: 93
That probably comes close to how I feel, though I'd honestly score ME3 closer to low 80s or high 70s. I have lots of lingering complaints with the structure and direction of 3, regardless of the ending.