Not really a big enough battery, cheating when it detects a benchmark app running, no IPX rating, no wireless charging, no shift in software UX from the 3T... it does have a good camera now which is a plus (keks), but the old generation design of the phone, coupled with non expandable storage (should have a 256GB option if no SD card slot is on it) and lack of advanced features will leave this behind the competition once again, even if the price is in the acceptable range.
One reviewer said his OP5 is now the daily driver, overtaking the Galaxy S8, yet in the same review he states the display and things won't wow anyone, they're just good, but nothing spectacular. I wonder how much OnePlus coined him to big it up that way given that the Galaxy S8 currently has one of the best displays on the market, the OP5 AMOLED panel isn't even HDR.
Considering all other flagships are going the minimal bezel approach with advanced features, hell even LG saw the light with the updated G6, it's not a good show from OnePlus.
To me, this is another HTC, it's too little too late, just HTC go one step further up the derp scale with their pricing structure. Although that's typical for HTC.