.... "The Inner Light" is great character piece for Patrick Stewart/Jean-Luc Picard and is subsequently one of the strongest episodes of the entire TNG series. Picard, despite having his memory of the Enterprise fully intact, suddenly finds himself on a different planet and with a different life and a family.
I will put myself out on a limb however, and honestly say that I do find "The Inner Light" to be a slightly overrated episode.
"The Inner Light" is very well written, acted and fairly well shot - however, I would not place it at the very top of the series. Watching Picard live out a full life as a husband, father and statesman opens the door for Patrick Stewart to shine and is very satisfying to the audience to see Picard being able to live a life he would sometimes regret not pursuing. "The Inner Light" is a high quality TNG episode because the Jean-Luc Picard character is such a great character and Patrick Stewart is so good playing that character; but it is not the most re-watchable episode simply because it is so emotionally heavy and feels so unlike the brand of sci-fi that Star Trek usually delivers.
I am supposed to give "The Inner Light" nothing but praise - and it deserves much praise - but I will take a number of TNG episodes ahead of it, regardless of how good it in fact is.