I don't know if A2s are harder or not than the old system. But I do know they shouldn't be, according to the report released after the inquiry into the 'A-level fiasco' last year.
I think the point others were making was that in the old system, all exams were at the end, but in the new system there are exams in january and june. Hence although the total content could be the same, A2 content is obviously going to be smaller than the total original A-level because AS content hasn't been included.
About standards... I can see several reasons why they may be slipping. If the amount of content remained the same and AS exams are easier than A-levels, but A2 exams are not harder than A-levels then inconsiderate of the marking scale, AS+A2 will always be easier than A-levels. This added to the possibility of resits made possible by modular exams, provides more freedom to improve grades. Also, non synoptic exams prevalent in AS & A2 simplify revision, making it 'easier'. This might make an A2 level 'A grade' non-comparable with an A-level 'A grade', making it seem standards are slipping. Standards will however only slip if university admissions requirements do not change to reflect changes in the A-level system.
This of course doesn't mean A2+AS levels are easy, just different.