It is interesting to me the varied opinions on this song (no pun intended) and other later Beatles solo material.
Personally, as I have stated I love it all...
Now... many people say they like such and such a band from (blank) decade. If John (unfortunately to lesser degree, because of unfortunate events), Paul, George or Ringo do a song/album with the sounds of the decade/times they are criticized. Paul in particular has done a very large variety of music (disco, blues, industrial, dance, classical, etc.) Ringo had an album or two that was disco. They are not doing songs that are out of place for the time. Yet, many will say, "That song is crap (or insert your own negative word)."
If the Beatles were still together and were still doing "She Loves You" that would be criticized. "Why can't they do something else?" or Why don't they do something different?" Well, they have... and yet that is not good enough.
Cloud Nine was a great album in 1987. Just like Abbey Road was a great album in 1969. (I am not comparing.) The difference is that Abbey Road had the tension of the band breaking up. It also had all four members of the band. There will never be another Beatles, and yet maybe that is a good thing. I think the bands that have been together since the '60s get kind of sad and worn out.
Art is a very subjective thing. I look at every album as a piece of art. There are paintings that are a single, random looking brush stroke that can be considered genius. True, some artwork isn't that good. We have all seen stuff that was either done by someone with little to no talent, or stuff that was done without much heart. I don't think there is a single solo album that falls under either criteria. We know the artist is good, and I believe every album has always had heart and soul poured into it. The only possible exception could be 'Two Virgins' or 'Life With The Lions', maybe 'Electronic Sounds'. I think those albums have possible artistic value as well.
Love each song/album for what it is. Find the beauty in it, enjoy. Isn't that what we listen to music for?