The video tapes may be lost, but at least we have audio recordings for all of the episodes and telesnaps for a great deal of them. While not a perfect solution, at least we have SOME record of all the early Doctor Whos.
Yes, there are many more TV shows in far worse state of affairs than Doctor Who. One of the show's contemporaries, Dixon of Dock Green, for example, has only 32 complete episodes existing out of 432 produced, which leaves more than 85% of them still missing.
There are 106 out of 701 Doctor Whos still missing, so about 85% of those episodes still exist, so it's pretty much exactly the opposite saved/destroyed ratio. However, there are many more rabid Doctor Who fans than Dixon ones.
Before anyone misunderstands, I like Doctor Who as much as anyone, it just burns my toast when a certain segment of Doctor Who fandom seems to think that only the recovery of Doctor Who episodes is important, and that anything else is useless/irrelevant.
A handful of black-and-white episodes of Till Death Us Do Part were recovered in recent years, but we're unlikely to ever see them on TV or DVD, while any recovered Doctor Who will be pretty much guaranteed of at least a DVD release.