I'll admit up front that I've only played the demo, but the issues that are preventing me from buying the game are all pretty apparent and unlikely to be significantly different in the rest of the game.
The biggest thing is the "puzzle" design, for want of a better term. Need to buy a newspaper from a vending machine? OK, use machine. Nope, you need money! OK, get your wallet from your inventory and use it on the machine. Haha, this machine takes credit cards, not wallets! You actually have to get your credit card out of your wallet and use it on the machine. This isn't a puzzle, it doesn't add anything to the game other than frustration.
And this is far from the only example of needlessly tedious gameplay. Need to search a filing cabinet for a specific file? Well, it could be one click, since your character knows exactly which file he wants, but how about instead you make the player search each of the four drawers separately and type in the name of the file each time?
Need to open a locked door to which you have the key? Well, get the key out of your inventory, because otherwise your braindead character will just keep trying to open the door without unlocking it.
Need to open or shut a valve? Your character needs to be told which way to turn it every. single. time.
Then there's the way the characters behave in completely bizarre and unrealistic ways. The train you're on suddenly stops for some reason, so you force the doors open and walk off into a pitch black subway tunnel instead of just waiting for the problem to be fixed. No sane human behaves this way.
Or how about this: You're a detective on the scene of an explosion. An employee at the building tells you someone's trapped inside. Do you call an ambulance? The fire department? Of course not, just break in and check if there really is anyone in there first, risking your own life (and that of this guy you just met) for no reason.
Add some awkward, unnatural dialogue, an interface that's constantly just slightly frustrating and (at least in the demo) some puzzles where it's never made clear what you're actually trying to accomplish or why until you stumble on the solution, and you have a recipe for a game that's not quite bad enough to make you quit in frustration, but isn't actually fun at all.
It's always disappointing to see Wadjet Eye pushing these inferior products, because the games they make themselves (specifically the Blacwell series) are the best adventure games ever made and a great example of what the genre should be like, but everything else they publish is absolute garbage.
Don't buy this game, it's terrible.