Well, for one thing, they don't care about anonymity at all. And already implemented a mechanism to blacklist content hashes on the demand of law-enforcement agencies. Both these things essentially defeat the purpose of many enthusiasts who would use it -- and its only function remains that of a volunteer-driven p2p network for making sure certain data doesn't die. And that's it, nothing else. Even that is somewhat ruined by paid pinning services.

For many IPFS is enough for what it does. But in a world where WikiLeaks and Edward Snowden are facts of life, it falls vastly behind on what's needed out there.

I'm not an expert on IPFS, but the things I personally don't like about it is the lack of anonymity (although I think it is possible to run it over Tor), and also it seems to only be useful as a store of static files.

I don't think it's possible to do a dynamic site, eg something that needs to read from/modify a database, using IPFS.

Not sure what project is better however. Dat looks pretty cool but also doesn't have anonymity.