Just be careful: these aren't connotations if they're paraphrases of the literal or primary meaning of the word/phrase. That's what most of the above are: they're explanations or definitions.
(Also, irrefutable has a different meaning.)
This is 100% good.
English is very subjective, but this is what I think.
What connotations do the following words/phrases have?
Wizadry --
Certainly a positive connotation, it envisages magic and splendour, particularly apt in the description of someone's actions.
Revolution --
Depending on context, this can be negative or positive...
It could be a revolutionary Idea (New, famous, connotation extremely positive) or an actual physical revolution, envisaging scenes of brutality etc. associated with the French, Russian etc. revolutions. This would be a negative connotation.
Global cyber disaster --
This is certainly a negative connotation. I can think of no context where this would convey positivity.
unforgettable --
This would be in a similar vein to
Revolution, as it is heavily contextually dependent.
An unforgettable sight could range from a murder to a good fireworks display. On it's own, I'd give it a positive connotation, but that is heavily influenced by the (mainly positive) synonyms
dangerous --
This, for me is definitely a negative connotation. Dangerous is dangerous, wherever it's used.

fragile --
Ah. another contextual dependant word. Fragile for me has a slightly positive connotation, but again, it's heavily dependent on the surrounds.
Again, subjective, so not necessarily right.