Hmm, my biggest lack of interest in Reach was my fear that it would be more of the same. You may say, 'But hey, it is Halo, and that is what people want, more Halo.'
Fine, but most popular game series have managed to do a good deal better than Halo in terms of fresh and new ideas from game to game, and when they haven't people got tired of them, much like I have done with Halo.
Looking at all my favorite game series, they have all made drastic changes over time. The second Zelda game was significantly different from the first one, and the third was significantly different than those two, when we finally got to Ocarina of Time, it was significantly different from the others. Metroid 2 was very different from Metroid, and again, the third one was also very fresh and original. Monkey Island is the same way. Half-Life 2 took a very different direction from Half-Life, and Valve has been careful to make sure new and original ideas were used in each of the expansions. All these games carried on the spirit of those that came before, but they made things new and fresh each time around. Halo... not so much.
So hearing that it is basically "Halo: The Greatest Hits Collection", definitely isn't a selling point for me. I like Halo, but I'd like to see something new and fresh done with the series. ODST was a step in the right direction IMHO, but not quite far enough. I had been hoping Reach would be a farther step in the right directions, but advertisements and what I have read about it have made me feel that it seems more like a step back from that direction. If I wanted more of the same, I pop my copy of Halo:CE/Halo 2/Halo 3/Halo 3: ODST back in my console, rather than pay $60 for it. Why own a bands greatest hits when you already own their entire discography?