Here’s the summary of a good post by Jeremy Walker over at Reformation 21:
So, when the issue of what it means to be Reformed gets discussed, we ask not to be lauded and applauded, so much as simply, accurately and fairly recognised as existing. It may be that you just did not realise that we exist. It may be that the kind of Baptist convictions – about soteriology, ecclesiology, pneumatology, doxology and a whole bunch of other ologies – to which you have been exposed have left you with some serious and significant questions, and you have given up looking for the answers among Baptists. It may be that you have met some who take the name of Reformed Baptists who, through pride or ignorance, have left you with a sour taste in your mouth, for which I am sorry. It may be – and I say this in a spirit of straightforward inquiry and not backhanded accusation – that you would rather not acknowledge this part of the spectrum because it does not fit into your historical narrative, and rather upsets your carefully piled apple-cart. But please do not repeat the old saw about Anabaptism; if I might be so bold, it will not wash. Neither dismiss us with the vague assertion that there are some Baptists out there who are both Calvinistic in their soteriology and traditional or conservative in our doxology. That is not what we really are, certainly not all we are. An honest historiography surely requires that – if nothing else – those original Particular Baptists (discounting, of course, the apostles and the early church!) are at least considered on their own terms, and taken for what they believed themselves to be, even if you might disagree with them.