Iota also relies on a central server[2]. So many others[3] have criticized it too.
[1] https://medium.com/@neha/cryptographic-vulnerabilities-in-io...
[2] https://domschiener.gitbooks.io/iota-guide/content/chapter1/...
[3] https://medium.com/@thedrbits/why-i-also-find-iota-deeply-al...
What's bad about the tangle? Its like hundreds of interwoven blockchains. Pretty good idea. GIT too uses a directed acyclic graph.
Skimming through the info on the tangle, concentrating on its dagness seems superficial (is it even one? They talk about merging nodes a lot which sounds like cycles to me EDIT: ignore this aside). Anyways, things like this should have security proofs (or at least arguments) and maybe it does, i havent read enough in depth to know. But if it doesn't i would say the skepticism is very well warranted
GIT, as you may know, has branches. IOTA in a sense, does too, a lot of them.
And again, this incident was caused by a Nodejs/NPM package, not by the IOTA tangle or protocol.
> the IOTA Foundation shut down "Coordinator,"
FIFY: centralized