While TFA is much better than TLJ and TROS, I don't think it's good either, just meh. TFA was leaning on two things to sell itself. One being a nostalgic call-back to what people liked about Episodes 4-6. The second was the original plotlines and characters it introduced. The nostalgia was a mixed bag, and often felt like a poor knock-off of Ep 4 (and even parts of 5 and 6). The new elements were also a very mixed bag, but at least opened up some interesting mysteries.
The problem is that the new plots/characters were 100% reliant on TLJ and TROS being able to properly clarify, expand and satisfyingly conclude them. They were abysmal failures at doing this. As a result, not only were TLJ and TROS themselves wretched movies, TFA retroactively became even worse due to its complete reliance on TLJ and TROS carrying its plot. So to me, TFA is mediocre at best in a vacuum separated from its sequels. Considerably worse after seeing the sequels.