1,from my perspective是比in my opinion好一些
其他一些类似说法还有
I maintain that,
From my part,
as far as I can see/as far as I am concerned...
I'd like to point out that...
Although I'm not 100% sure,I still think that...
2 用is 不如 In addition to what has been mentioned above,
语法可参考
as mentioned above是as it is mentioned above的省略，as引导状语从句。
as is mentioned above，as为关系代词，引导的非限制性定语从句。
两者结构不同，但意思表达相同。
另外类似表达还有furthermore， additionally， moreover
3 感觉a greater extent/degree 更常用
4 play更常用
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