From Eurogamer:
There are a few problems, but they are mostly limitations of the hardware. The draw distance and frame-rate aren't terribly solid, although this never interfered with my enjoyment of the game, and as with previous Lego titles the camera doesn't always lend itself well to precise platform jumps. With a heavy emphasis on the Wii U GamePad (see sidebar), the game also lacks any multiplayer features, which is unusual for a Lego title - it didn't bother me, but you should take it into account if that's a big part of your relationship with the series. Lego City Undercover is also guilty of some of the usual open-world genre sins, like long journeys between objectives and repetitive side missions. The biggest blemish, though, is the load times when moving between level interiors and the open world - these are weirdly long and the only time the game loses your attention, with not even a set of amusing tooltips to distract you.
That's worrisome.