I recall a few people on here having trouble with boolean (myself included). If someone had have shown me this info last week, I would have kissed their feet  . Everytime I use boolean to create complex holes, if there are multiple holes, I find myself having to make a sample on a plane and then arraying it for the other holes and welding the whole thing together because boolean used to always mess it up. Many a time it would only make half the cuts needed and leave the rest out. I have figured out it could be because I usually cut holes into flat polies with no edges on.
See the images of what I mean  .
Image 1: Shapes I'm using to cut through the plane.
Image 2: Cuts needed on the plane in order for the cutting process to be successful.
Image 3: Unsuccessful cut due to lack of cuts on the plane.
Image 4: Shapes attached as one object.
So the bottom line is, I don't think that boolean will let you down if the necessary cuts are there to begin with. These cuts will help boolean to reinforce the shape it makes.
Another good thing that I think may help people who don'#t already know is that if you have multiple shapes that you want to use to cut through your mesh, attach them together as one object. Boolean doesn't seem to be able to handle more than 1 object at a time.
Also, I find that I get best results with the 'cut - refine' option selected, but this is down to user preference.
Hope this helps  .
Any feedback welcome.
   
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