Its a good engine. Its chief designer Osamu Goto worked for Honda and then the Ferrari Formula 1 team before designing the E01. If Nanqi are going to produce sports cars then they have good reason to be interested in it.
Its not well proven though which may explain why the press article talked about technology rather than the actual engine. Its probably also a bit expensive to produce which is why Proton never took it up.
MG7 is based on the R75, little newer, same tools from Longbridge, wellknown quality
Roewe 750 is something totally different, only looking similar, other tools used, quality still to proof (crashtest etc...)