I think it all boils down to your preference over how a film should end. Some people like definitive endings where everything or most of the things are either mapped out or resolved. People like resolution. However, there are some, like myself, who enjoy the ambiguous nature of open endings. Allowing the audience to determine which one was the true ending, and then having limitless discussions over why they think either one is the true ending.
, while I'll try not to be disappointed in you using, basically, a "some people like to be force fed and some people don't" argument against me, I'll ask you to read all my comments again. You should know that I'm not a "force fed" film viewer. But all my comments have been about what kind of ending a film sets itself up for. Sometimes a film sets itself up for an ambiguous ending, and if I feel the film deserves it by going for that kind of flavour the whole time, I love it. But in my comments above, I've discussed why I don't think Inception merits that kind of ending.