How to say "I wouldn't go so far as to say..." in Mandarin
It is more natural to say

还没有……到……地步

For example, 挺好的，但还没有好到那个地步。
Or

it tastes fine, but I would not go so far as to say that it is delicious

can be

味道还行，但还没有好吃到十分美味的地步

Well, if you were in a more oral conversation, you would normally say

但也没有很/特别……
但也不是很/特别……

For example

I went to the national park, which was a good trip, but I would not go so far as to say that it is wonderful

could be

我去了国家公园，感觉还行，但也不是特别好玩