Due to the shenanigans of the DLC on disk, I am 90% positive ME3 is the last Bioware game I'll purchase.
But you have bought / will buy it? Yeah, that'll show 'em.
I'm the only person who can decide what a game is "worth" to me, and I absolutely did buy the ME3 DD edition, just like I bought the ME2 CE and all the DLC. ME1 and 2 are two of my all-time favourite games, so why wouldn't I?
I played the From Ashes mission last night, and you know what? It's not crucial to the game like some people want to make believe. Yes, it adds some back-story. Yes, it adds a character, and yes, the core game would still be entirely playable (and enjoyable) without it. So if you're dead-set against DLC, skip it. Skip the whole game for that matter, it makes no difference to me.