or是联词,连接两个并列的成分,只要成分相同就行,并不需要词性相同.这个句子是系表结构,or连接的是两个并列的表语,表语可以是形容词也可以是名词.rewarding在这里是形容词,而waste是名词（a waste of time是个固定搭配,意思是浪费时间,核心词汇是waste,time只是修饰waste的）,形容词和名词都能做表语.所以不需要将waste改成动名词,而且浪费什么什么的固定搭配一般都是a waste of. 比如：a waste of time a waste of money a waste of wate
语法it can be rewarding or just a waste of time改成wasting time
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