No I do not have different criteria. First of all, my criteria is that I would buy CPO BMW X5 for 45K not friggin Mazda.
Of course your money, you can spend it however you want. As I said, in that class, RAV4, CR-V, it is better vehicle for sure.
Yeah, and I have zero desire to own an X5, or, like you note...they're available within my budget. Performance is identical to my CX5 for turning, stopping, accelerating. MPG is worse. Reliability is far worse. It is roughly 1dB quieter inside at 70mph, so that is appealing, but not a massive margin, still there, though. The only creature comfort it has that I think would be cool are the massage seats, presuming it has those in some trim levels? I didn't see them, but I think they might be available? I just see zero appeal to the X5 unless I needed a larger vehicle with a 3rd row, and then, I'd buy a Lexus 570 or similar, because by the time you go 3rd row, it's not about corners and the like in the slightest (As this scathing review below of the X5's handling proves). (This is comparing to the 35i X-drive, not the M, which you won't be finding for $45K cert. pre-owned in recent production, nor would I want to pay out the nose to keep the beast on the road once purchased.).
Nothing about the X5 except size/capacity seems better "by the numbers" or "by driving impression". It does have a 3rd row option, if size of cargo is of import. Otherwise? Nothing for me. NAV screen is much larger, if that's a selling point? But it lacks HUD, which matters more to me.
Although we don't expect any three-row luxury SUV to be a corner scorcher, we do expect BMWs to be among the best to drive in any given class. The X5 is far from that. It exhibits sloppy body control and lifeless steering, as well as unrefined ride quality over rough surfaces (the Pirelli Scorpion Verde All Season Run Flat tires might be to blame for some of the impact harshness, but non-run-flat tires aren't available).
Why would I want that in my life?
It's glaringly obvious. You only care about image and brand. Some of us care about product not label. Like I said, your priorities are not mine.