Isn't this pretty much with a lot of decktactics. People will dislike it and complain about how they can't deal with a lot that easily.
Mill would be one, but there's also Land destruction, which is something a lot of people complain about. And what about Combo decks? And let's not forget the current influx of infect/poison
I'm not adressing this to anyone specific (even if this is a reply to a post), but looking at the Magic community I'm part of (mostly Magic Online), some people will complain about anything that's not geared towards playing a few creatures and turning them sideways and sludging it out with other creatures and eventually doing 20 to your opponent. And even people complain about this, because people think that this is degenerating the game itself.
As for mill decks; I can think of a few solutions that are not blue. Chances are if you pack those, they'll pick up their deck and move on to the next player since they can hardly beat it. Here's a list;
- Emrakul, the aeons torn (or any of those big Eldrazi, just as tech versus mill decks) - Colorless
- Elixer of Immortality - Colorless
- Wheel of sun and moon - green/white
- Leyline of Sanctity (and other things that give you as a player shroud/hexproof) - white
- Gaea's Blessing - green
And let's not forget anything that reanimates creatures from your graveyard (mostly black). Versus mill decks it's pretty much toolboxing what you need.
Is it ridiculous to put card X in your deck to face such a deck? I doubt it... at some point you'll run into people that use other means to win. And as long as WotC prints them, I guess they consider those tactics valid enough. Against some types of decks you just have a bad match-up, even if it's just casual play.