Lacking in many ways, but decent first effort from the developers.
The interface works. The hint system is both good and bad. When used, it generally makes the game too easy, and when not used, some of the keyspots are way too easy to miss. All the glory to oldschool pixel hunters, but there is really no excuse for that anymore. Some of the puzzles are very well done, but some are just ridicilously out there.
The story is okayish. It starts quite good, but quickly loses its edge. It doesn't help that the dialogue isn't all that great either. It's obvious that the writers were trying desperately to be funny, but fail most of the time. When the joke is actually funny, the horrible voice "talents" miss the punchlines 99% of the time. This is probably the weakest point of this game. The way the story is told makes me want to throw my headphones out of the window.
The voices, both environment and characters, are really horrible. It also doesn't help that the voice recording is a patch job. It's very clear that different parts of the dialogue was recorded in very different settings, location, whatever, and later patched together. It's a combined effort from the voice cast and the recording crew, and it's a failure. The most hilarious part is how sometimes the voice of character changes between sentences from low grunt to medium grunt, and then back to low, fo example. And it also sounds like everyone is in a hurry. There are barely no pauses (this is especially stupid when a character is supposedly speaking with someone on the phone), everything is delivered without missing a beat. It's just very unnatural. The backgroud ambients, while generally okay, are also too generic, as well as sometimes they loop badly.
So, while this is a decent effort from the German developers, it's also very clear that there is a lot of work to be done to make the Secret Files 2 a really good game.