I don't tend to change my opinion on games that much anymore - usually if I like it I'll probably still like it later.

There were a few cases as a kid where I didn't like less graphically sophisticated games (like the first two Monkey Island games) because I was used to the visual style of later entries in the series - but now graphical style is probably one of the least important factors for me. The only games that might benefit from a reappraisal are the few games that I have mixed opinions on (like KOTOR 2 for example) because I value some aspects of the writing but have issues with the tone compared to the first game. Maybe I would be less judgmental of the difference now.