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Quoting hal9g:

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  Using the most commonly credited form of an actors name seems to be, at least for me, the easiest and best solution.

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Well, I personally understand why you do that, but I fear that strictly speaking that is not what the Rule asks us to do.

Quoting the Credits Rules:

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Use the "Credited As" field where the person's name differs from the credited name.

To determine whether to enter the name directly as credited, or to use the "Credited As" field, use the Credit Lookup tool.

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Are we supposed to know in advance that an actor listed in the film as "John Doe" is actually "John Quincy Doe" and that we should use the CLT to check each and every person listed in the credit roll to see if we should be using the "credited as" function? 

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Of course not, but -let me play the devil's advocate!- you are supposed to use the CLT if you know they are the same person: there is not an option whether to use it or "refuse". 

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Besides, someone might object to your contribution on those grounds, claiming that the person's Name differs from the Credited Name and that you should thus have used Credited As ("John Doe") and the Common Name as determined by the CLT ("John Quincy Doe"). Especially -I guess- when "John Doe" and "John Quincy Doe" are already linked in other profiles, and if some documentation is provided that proves the link.

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Quoting EnryWiki:

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Well, I personally understand why you do that, but I fear that strictly speaking that is not what the Rule asks us to do.

Quoting the Credits Rules:

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Use the "Credited As" field where the person's name differs from the credited name.

To determine whether to enter the name directly as credited, or to use the "Credited As" field, use the Credit Lookup tool.

Are we supposed to know in advance that an actor listed in the film as "John Doe" is actually "John Quincy Doe" and that we should use the CLT to check each and every person listed in the credit roll to see if we should be using the "credited as" function?  I'm sorry, but I think it's unrealistic to expect people to do this except for those familiar actors and actresses.  I think Unicus is on the right track to base his contribution on the end credits.  Except for possible capitalizations, there's no doubt as to what the end credits show.

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I cannot speak for others, but the only time I use the CLT, is when I already know variants of a name are out there or if when I go to add the actor to a profile, more than one variation shows up in the actor list.

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I believe the real solution is going to have to come from Ken in the form of a programatic change where Profiler ignores "," and ".".

So all these would autmatically be equal

Robert Downey Jr
Robert Downey Jr.
Robert Downey, Jr
Robert Downey, Jr.

The similar solution for these type of names

Penélope Cruz
Penelope Cruz

Let the program link the names and we just enter the data as we see in the credits.

Until then I would say go with the most commonly credited as using the credit lookup tool.