I'm even not sure whether also non-0-fee TAs were/are forgotten which were/are totally valid.
At least it would be very helpful to have a probability whether a given TA will be included into the blockchain.
http://bitcoinfees.21.co/ seems to be of no help to this last question, isn't it?
As far as I know there are no websites that show probability calculation, and you can't calculate this based on a single node (i.e. your node). Different nodes have different rules. When it comes to zero confirmation transactions you can see that the delay is estimated between 15-Inf amount of blocks. It is like that for a reason.