I grew up watching these Lear shows and remember them well so I was excited to watch this.
Good Times- I felt as if some of the actors do not know their lines as most kept making an "uh" with a brief pause then deliver their lines. I don't have the original ep to watch to see if that's how they did it, but I recall the series particularly well and I'm pretty sure that was not the case. I really like Anthony Anderson, but a singer he is not. Even though I didn't like this remake as much as the original, it was still worth seeing.
AitF - I actually saw the original not too long ago so I can compare the two. This was a better job of remaking and staying close to the original. In the original for this ep I didn't like Mike's acting particularly as it felt forced. In the remake I don't like the replacement actors but I feel like they generally delivered.
So all in all, for those of us old enough to have watched the originals this was a nice treat although it was a little light on the sugar.