The problem for me (and the average British voter) is that the issues are far too complex for anyone to be able to make an 'informed' decision. I've watched Question Time for the last three weeks, and now I have even more questions than I did before I started watching! Added to this we have the unhelpful 'non-information' fed to us by Cameron, Osborne and Johnson. Headline stuff only, such as "XXXXX jobs will be lost if we leave the E.U." The next day, "XXXXXX jobs will be saved if we leave the E.U.". Therefore the only way that the average voter will vote will be on a 'gut feeling' which is worrying.
I'm not even sure that the British public should be asked to make such a decision. In 1965, Parliament voted to abolish the death penalty, a liberal policy that most voters would support now. However had there been a referendum in 1965, undoubtedly the British public would have voted against such a measure, as feelings ran high that hanging wasn't such a bad thing (ask my dad!).
Therefore we are not qualified, we don't understand the issues, we can only guess how either option might affect us personally, and solid facts are hard to come by. I will vote, and I lean towards voting in favour of staying in the E.U., but currently I am still very much in the 'undecided' camp.