Publishing in multidisciplinary open access journals in computer sciences
What is the reputation of multidisciplinary journals in computer sciences like Plos One and IEEE Access. 


It is not possible to comprehend the answer as 'reputation' is undefined.


  Both of these journals have impact factor higher than 3 while IEEE access was started just four years ago. On the other side, it took a long time to get even an impact factor for computer science journals.


This is trivial. Thomson Reuter has to generate the statistics related to the number of articles published, the number of citations, etc. for a long period of time to generate a number called Impact Factor (IF).


  What would be the reputation of the articles, from computer science discipline, published in these journals.


As @JeffE pointed in his comment, it absolutely depends on the article itself. Every article published by a specific journal should not be weighted the same.


  Can we compare the impact factor of these journals with other computer science journal having similar impact factor.


Comparing two different journals based on their impact factors is pointless and inconclusive.