I work for government. I work with some pretty contentious issues. I deal with FOI requests all the time. Personally I think it is a good idea for a great number of reasons, provided you have the resources to host and support it.
Firstly is that of bias. Journalists have some, usually depending on who they're working for. However I've found that more FOI requests come from A) Lawyers, and B) Special Interest Groups, both left and right, industry and association. In most cases, there isn't anything overly shocking about the information that the government has. However whoever is getting it will want to twist whatever it is towards their own purposes. In some cases this results in the misrepresentation of facts, or the omission of inconvenient material. However there is nothing government can do, we're obligated by law to provide the information, and can't control how it is used. By making sure that the *whole* information request is released to the public and made available to everyone, anyone curious about the story that was written, or the facts that were released, can look it up and judge for themselves what is actually going on.
Secondly, it is a very small subset of people that request most of the FOI material. As mentioned most of them are a select few with an agenda, or lawyers working on their behalf. What a lot of people do not realize is that government needs to do a awful lot of work for these requests. We have to do them, there are strict time lines (so you have to drop everything else), and have little control over scope. A *LOT* of money is spent fulfilling these requests for a very small select few people and groups. On release, the work is already done, the money spent. You might as well provide the information to the widest group of people as possible for the most benefit.
Lastly, as mentioned most of these requests is one group of people trying to get dirt/leverage over another group of people. Is it fair that one group is being notified and not the other because of who requested the information? In fairness, if an environmental group is looking for information to try and use it to limit industrial development in a particular area, should the folks doing the industrial development also not get access to the same information to use for their counter arguments? Also along the same lines, this would also cut down on the number (hopefully) of like requests from the various groups saving government money from doing multiple FOI requests that have already been completed.