As a maths teacher, I find the IB's offerings superior to A-level. The choice of studies, standard level and higher level caters for a wide range of abilities, and the options offered for higher level make those offered at A-level look a bit meager. So, as long as the IB provides good quality work for my students, I'm not desperately worried about its shenanigans. However, since we are talking about plagiarism, I have to mention coursework. In theory it is a nice idea, but it should ditch it.
From the TES website (www.tes.co.uk).