It means well, I have no doubt of that. It wants to be loved, it wants to make us laugh, it wants to show us big things exploding, it wants us to not get bored, it wants us to have fun.
Unfortunately, too much of that depends on thinking the presence of Duke is in and of itself fun enough. Take him (or at least the vague, fan-fiction-like concept of him, which is what we really have here) away, and whats left? The trailers for about 30 different games from 1997-2011 stitched awkwardly together and made passingly interactive, with little rhyme or reason.