Really? The larger iPhone is not a "usable" day to day phone? What the heck do you think the millions of Samsung Galaxy users are using??? Their phones are 5.5" to 5.7" and they are all over the place.
How is a 5.5" screen phone not a "usable" phone when people are already using a larger phone?
The Galaxy phones are 5" ... but most reviewers also agree that the Note phones are too large as well. The 5.5" market is much smaller than the 4.7"-5" market.
Obviously, people make sacrifices and use the devices as phones. Does that mean that it appeals to the masses? No. Does that mean that the form factor is right for a phone? No.
Again, you want a phablet. Great. Enjoy your phablet. Many (arguably, most) other people want a phone.
Not that it matters, but I spend roughly 4 hours/day TALKING on my phone and the other 8 or so processing emails, calendar and goofing off. For me, it has to function as a phone... and that's the point. I get to have all of these devices in one portable easy to use device. When I want to read in bed or play Clash of Clans, I break out the iPad Mini. Again, for me. You have a different use case, and that's great. Apparently the reviewers have a use case that is more similar to mine than yours.
Don't feel slighted because they didn't appreciate the size of the device that you chose. Sheesh.