...but when you compile four minutes of clips out of 8 seasons worth of material, isn't it really possible to make anything seem like canon?

Totally. As is abundantly proven in Carol S.'s Schoolhouse Rock vid trio.

But, yeah, I've heard that the actual canon is not so much with the slashy moments. Of course, this is no problem for me - I mean, like I ever know the canon anyway - so I continue to enjoy the pairing. (Remember when I said your FF was likely to start me on the Stargate path? Well, it did.)