Because Maiden never had written songs of questionable quality up to that point? Like Charlotte? Let me quote a verse in the case you forgot:
There are plenty of songs on the first couple of albums, as well as some that came later like Quest For Fire, To Tame A Land, Alexander The Great or a lot of the material on No Prayer For The Dying that have been criticized for their lyrics throughout the years. The lyrics for Wasting Love are genuinely well written in my opinion:
I'll give you Robert Maxwell, motorbikes (though it's a Charlotte sequel) and football, but what's the issue with songs about the AIDS epidemic, lost childhood (even though that one's a bit more generally about problems of the world) or the general concept of Wasting Love? Characterizing it as simply being about "unsatisfactory sexual encounters" is almost misleading. What about being home sick due to being on tour like Wasted Years? Why is that "okay"?
Don't get me wrong, there is no right or wrong on this and you are entitled to your opinion. I just pointed a few things out because I found the criticism to be somewhat unfounded, but if you really feel that way then that's valid.