It is great that he admits it was a server crash; many servers I know will claim it was a DDoS attack. And, from past experience, server crashes are difficult to resolve. When you fix one problem, another one appears, which is why I ran SolaceRO in GDB when it was still up, so that if the server crashes, I will know why.
As a player, I understand how frustrating it is, but new servers, particularly this one, will have issues at first. I do not think it is a problem as long as he communicates about it and sets the right expectations.
The OP is not wrong for posting; as a player (customer), he has the right to complain about the service. However, it should have been more objective by posting the number of days it was down, as well as the time between the last downtime and the most recent one, so that it is more credible that it occurs frequently and is not just a form of exaggeration.