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Ruby is the subject in that sentence, not sure why gtranslate injects an "I". I'd translate it as "Ruby is scary, isn't it?"

Could also be 'surprising'. With the context of the sentence before it is basically, "I thought this would be hard to write. Ruby is surprising."

Also, the author is a contributor to ruby on github, so I doubt he is negative towards the language.

Yes it's one of those "funny" words in Japanese that is highly context sensitive, so you're probably right.

Yeah.. 恐ろしい is kind of a "Wondrous and terrifying" blend