@Adebesi you are right in that I did simplify things a bit, but I do not agree with all of the criteria you have listed.
Take "attention to detail" for example - that was arguably another of Moyes' big failings, that he couldnt see the forest for the trees, so to speak. I actually think that when you are managing such a huge entity as Manchester United, that too much focusing on the smaller details will in practice just distract the manager from the bigger picture at times. For a smaller club you are absolutely right, but I feel that paying too much attention to small details was a trap that Moyes fell in to, whereas SAF was known for delegating large responsibilities to his backroom staff rather than getting bogged down by trying to micromanage.
Tactical acumen is another interesting one. Obviously it is one of those things that most people instantly associate with a successful manager - but lets look at our recent examples again. SAF was known for many things, but I think it is fair to say that he wasnt always a tactical genius, particularly in his latter years. His insistence on 4-4-2, defensive lineups aimed to counter opposition threats rather than maximising our own, and failure to change things up through substitutions until the game was already lost, were all criticisms often thrown at him. And yet the results speak for themselves.
Conversely, at the moment we have LVG - someone who was largely regarded as one of the best tacticians around, and it is the opinion of many that he is overcomplicating things, spending too much time and effort trying to force players into his system etc rather than letting them play their natural game. Obviously time will tell as far as the results go, but you get my drift.
So when it comes to tactics I would say there has to be a balance, and personally I think that is a balance that Giggs will recognise and would achieve thanks to his tutelage under both of the managers I just mentioned.
Other factors such as intelligence and work ethic are a given, I would say, but neither of those are directly related to experience. The biggest area for concern when it comes to Giggs' lack of experience is one that neither of us actually mentioned until now - handling the media. That said, neither Klopp nor Guardiola are used to handling the particulars of the UK press, which has put off more than one manager in the past. Giggs at least has the benefit here of being native to the country, and thus you would think he would know a thing or two about how the UK press operate - not to mention he can always get on the phone with SAF for advice in how to deal with journalists, as a last resort.
In answer to your question would Giggs be any good at the job - I dont know, and nor does anyone else until we see how he does first hand. However what I do think is that he would be a better manager of Manchester United than he would a manager of Cardiff, West Ham or Everton. I agree entirely with the comments from some other posters in this thread that
if Giggs is going to manage United, it should be after LVG, not 10 years down the line.