The problem with Intel's GPUs isn't the end performance per se, but how we got here: they delayed them multiple times, have only launched in China (and Korea in laptops), overprimised how well they'd perform (they're one step below of what they said) and their drivers still leave a lot to be desired, specially in older games relaying on DX 11 or older.
Those are the main criticisms.
And yes, Intel has managed to do this all by themselves, without buying another ocmpany... mainly because they couldn't do it. Instead, they've just knocked on AMD and Nvidia's doors and hired a lot of people from them. So yeah, they may have started from scratch, but they've done it with people that have ample experience in how to make GPUs.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.