Blackwarder
Adventurer
The "Adventure Begins" set was really quite poor, but it was also dirt cheap, and probably (just barely) worthwhile just for the 'extras'. I don't have either of the other two.
However, my understanding is that "Beginner Boxes" in general are generally poor - most experienced designers don't want to work on them, because they'd rather work on the cutting edge (however that is defined), and because they're low-prestige items. Which means they get passed on to lesser talents, or they're produced by people who don't want to work on them - either way, this is seldom a recipe for success.
(The B/X and BECMI Red Boxes, and also the Pathfinder box, appear to be shining exceptions to the above. So it can be done. But I think the key there is that they happened to have one of the "premier league" designers both working on, and enthusiastic about, the task.)
Interestingly, WotC's market research before they did 3e suggests the opposite - that new players actually thrive on crunchy systems that handle a lot of stuff for them, and have difficulties grokking a system that leaves more open to DM fiat. Whether that remains true, and whether it holds both for introducing the game and retaining new gamers is not clear.
I honestly don't get why someone won't be excited about working on a beginner box set for D&D, it's essentially the most important product every, if it weren't for the black box back in 91' I would never have played D&D.
Warder