Nick Wangler (@SweetTea023) asked me why people hate Flash (no doubt referred to me by @Wygle or one of my Seattle cohorts). The answer is far more than 140 and has been answered posited and pondered by many more qualified than me. I will, however, endeavour to round out the corners of the various arguments against it and be as non-duplicative as possible.

Security

A very quick search on NVD shows 77 vulnerabilities for "Flash Player". Flash is an add-on for your browser; an expansion that you install (or have installed for you by an OS distribution or computer manufacturer) in addition to the base components. By default, that creates yet-another vector for attackers and even levels the playing field a bit for them since they can target multiple platforms and multiple browser configurations with roughly the same exploit. Believe me, Microsoft & Apple do not need any more help making their browsers or their systems more vulnerable to attack and we certainly do not need to give the malware writers more soft targets.