That's fair enough if you felt that way. I would have liked slightly more open areas and more explorable stuff too. Though I don't really know how large the areas in the game are because I haven't played it yet. I did however know from early on this would be a linear cinematic game, every single demo and trailer has showcased it as such.
Presumably there is some level of exploration or exposition available in the game though, because there are quite a few collectibles, readables etc, and multiple trophies associated with them. I can't imagine they will all just be littered in linear corridors and hallways, and that many will require searching around to find. I think that's one of the problems watching videos of a play through where the guy basically doesn't care about any of that stuff.
On a side note, I appreciate and respect the right of people to reject games by talking with their wallets, and the reality is that there isn't a whole lot of content here for the money compared to some other games, especially from big AAA publishers like Ubisoft or EA. But then as hardcore, forum dwelling gamers who are more knowledgeable than your average gamer, there is another side to it. This is the first console game from RAD, one they spent 4 years making, and one they've developed an entire next gen engine for, in-house. Similar to Uncharted (1), I think the expectation for this to be some massive semi-open huge game, was probably a bit of a stretch, but I also expect the sequel to be far more content rich. Looking at the quality of the assets RAD has put in to this, the amount of man power and resources it'd take to offer this game in a semi-open world or much larger scale, would likely be exponential. Not everyone has several hundred, or even thousand developers working on their AAA engine and game. But here's looking forward to how much more RAD can do in the sequel.