I have to disagree with almost everything Vrecknidj said,
1>don't just use the core books. most of the customers who are buying WOTC modules have most of the other WOTC books. let's use them. Plus, a little marketing never hurt anyone. My players use the other books, why not let the bad guys use them too without me having to do all the work.
2> errata and web enhancements are always welcome. sure, we all like to think that if you take the time a product will be perfect, but that NEVER happens. Errata fixes it. It doesn't mean that they're purposely sloppy.
And web enhancements? extra stuff for free for us. and wizards gets people to go their website and see their other products. everyone wins.
3> too many new monsters in the 3e adventures? what? I think there was one per module. and then cool twists on monsters like the tombstone golem. I agree that the mooncalf was ridiculous, and just replaced him with another monster, but to use that as an exuse to not have new monsters is silly. Every module should have at least one new monster, spell, magic item, etc.
Ed Cha: Wizards of the Coast giving free adventures might hurt YOUR business, but the free adventures get people to go to their site, which spurs sales for them. And sure, some/most of freebies suck, but so do some/most of the paid-for adventures too. I'm not an expert DM, but there's very few modules I would run as is.
But what would I like?
I don't want a mega-adventure, but I would love a continuing series of adventures. The 3e adventures occasionally dropped references to Ashardalon or Durgeddin, but it could have been so much better if they put any planning or forethought into it. Also, with all of them having different writers, I think there was an Elder Fire Elemental three adventures in a row. Thats inexcusable.
I DO want a mostly (not completely) dungeon crawl, with NUMEROUS VALID plot hooks to get even the most jaded player inside. (unlike, say, forge of fury, which had 0 in the way of plot hooks)
AND a wilderness based adventure
AND a city based social intrigue/political adventure
AND a comedy/odd ball adventure
AND a couple of adventures where the plot threads lead to a mix and match of different sites.
all rolled into one long adventure path.