I was still getting rejects from mining on my CPU, which ofc is the lowest of hash rates you can go. So I don't think that can be the issue, even on my spare PC with a nvidia card using Cudaminer I was getting rejects. I think the difficulty just needs to increase which in turn with let the overall hashrate increase, therefore letting more of our blocks be accepted. I think the difficulty is just tooo low atm, it might seem like a miners paradise but I don't think that is or ever was intended to be the case.