This is wrong in so many ways. XenForo is far from being bested by IPS. Each platform has their individual strengths and weaknesses, but XenForo has plenty more to offer. They've actually released both 1.2 and 1.3 within the last year and several third-point releases in between. XenForo is far more active than IPS in terms of proactive development, especially with their new approach to said development (releasing smaller patches for continued content rather than one big patch every few months).
XF 1.3 focused heavily on moderation improvements. Version 1.4 is rumored to be core improvement oriented (the features allegedly "missing").
mmj - Bottom line, XenForo is a more sociable platform. Far easier to design and manipulate on the fly in comparison to IPB's rigid template system (which doesn't grant access to core functionality and requires you to delve into your FTP). There is no denying that IPB has far more built-in features, but I'd rather start with a product that has less and build upon it, than work with bloatware. XenForo is not inferior to IPB overall. Don't let biased critique sway you from creating an objective opinion about both platforms.
For the record, I favor IPB but love XenForo as well.