If you played and enjoyed the first Touch Detective, than I can pretty much guarantee that you will enjoy the second game. It almost feels as if this is a straight continuation from the prequel. Touch Detective ran about 7-8 hours at tops, and they really wanted to make sure that this one was a little bit longer, so this one will run about 10 hours on average. How did they make it longer? It's not really that the cases are that much more involved, but they have a lot of bonus cases, and bonus things that you can help out with to get the final outcome.
Was this game what we had hoped for? Considering that it's a sequel to Touch Detective, I would say that it definitely is. Touch Detective fans will enjoy this one just as much as the first one, which is what they were trying to achieve. Could it have been longer? Of course, you don't want it to end as soon as it did, but I would have to say that as for us fans, we are already awaiting a sequel to this one.