You should still explain why it is the worst thing ever. Ads have been in movies, TV series and whatnot for ages and ages and movies that have them are no worse for them. Sure, a game like Oblivion should never have ads and I'm pretty sure they never will, just like Lord of the Rings doesn't. But games like Deus Ex, SSX and the like that take place on Earth/modern times... how would it make them any worse to have some ads during loading screens or at the sides of the tracks? And I don't mean annoying TV ads, I mean (small) pictures that market some new movie or the album of one of the artists who's music is in the latest SSX.
We know publishers are somewhat struggling with rising development costs. People are already whining about 60$ games, many waiting for the inevidable 20$ bomba-prices. If publishers can't whine about used games sales, nor can they release any DLC and people aren't willing to pay any more for games than what they already cost, then they'll have to come up with additional ways of getting money. I know you people hate EA and Eidos and Square Enix and all the big publishers, but they make games I enjoy and I don't mind if they have more money to hopefully fund more games like Deus Ex, SSX, Beyond Good & Evil 2 and whatnot, especially if that money comes with no more expenses to me and with no impact on gameplay whatsoever.