Croatia are going through a generational change and are unlikely to be as consistently good as in previous years, but that doesn't mean they don't live up to the rating. And overall, this rating is complete nonsense - remind me how many titles (or at least achievements) Belgium has won? And they were in first place for quite a long time.
Belgium is another story thanks for bringing it up. IIRC you are right, maybe not just #1 but top 3 in FIFA ranking at one time for years and years... and yes I think they had a cool team but you don't care about anything if you win titles.
On the other hand you have some cool teams in 50+ places that for sure always lose badly to top 10 teams but they play amazing football given conditions. USA team is shit, and Scotland to me is much better but they are always way below them. Why because US plays shit teams like Honduras and Puerto Rico while Scotland has to always meet the top 20 teams.
Which is to me why FIFA ranking needs either to change or to be ignored.