If you compare 'Casper Genie' to the very early Casper cartoons and the surprisingly excellent 'Boo Moon', the difference in quality is staggering.
'Casper Genie' is a lesser effort of the Casper cartoons, though there are worse Famous Studios cartoons.
While Sharples' music still shone and the voice actors did their best the animation suffered due to lower budgets and tighter deadlines, the humour became more tired and slow in timing than sharp and funny, the stories became increasingly predictable and rehashed and some characters started losing their initial spark, this is particularly true of most of the later Herman and Katnip cartoons. Admittedly though, by the mid-50s through to the late-60s Famous Studios' cartoons did get repetitive. While they were very formulaic they were always well animated and voiced with some funny parts, some poignancy and decent characters and their regular composer Winston Sharples could always be relied on to write a great and often outstanding score. Famous Studios' cartoons are not for all tastes, but my opinion is that their early stuff and some of the early 50s output are good. Onwards, the quality did diminish quite significantly though the overall cartoons varied, some decent, many mediocre. The late-40s to the early/mid-50s Casper the Friendly Ghost cartoons had a higher budget and overall the overall quality was much better.