Plutopia,
I hear what you are saying and we can both agree that getting accurate numbers to arrive at a current and correct NOI is very important and necessary to evaluate a property. I still do not agree that cap rates are usless. I will just agree to disagree there and here is why:
Let's assume you shoot for a ROI of 25%, a DSCR of 1.5, and etc., etc. Now let us assume you find an investment that meets all the numbers you shoot for and you purchase the property based on those numbers. As it turns out, the cap rate on your purchase (using the true NOI form the P&L) gives you 9.5. But that type property in that area has an average going cap rate of 10.5! You just overpayed for a property, regardless of the fact that your other figures hit your target. In other words, if you had based your offer on the 10.5 average cap rate for that property, your other numbers would have been that much better.
The example above is long, but I hope I am making my point clear. Again, I agree that cap rates using crap or false numbers are useless, but cap rates with the right numbers plugged in are an essential part of evaluating income producing properties.