Have owned 2 29ers and they’ve definitely got their merits, I just think for the type of riding I prefer that 26″ wheels still make more sense. If I was racing XC or doing big all day long distance rides all the time, I’d have one again in a heartbeat, you definitely notice they hold momentum better and are much more forgiving of poor line choice. But for me, I prefer riding tight, twisty, very technical singletrack whenever and wherever possible, and though I realise that probably only 10% of my riding could be described as such, I’d rather have a 26″ wheeled bike normally for the slight increase in agility (perceived by me, your opinion may differ) they offer. Though this could just be frame choice, I know my 26″ hardtail to have exceptionally sorted geometry for the type of riding I do mainly (designed as it was by jameso up there, which makes me keen to try out his new 29er!).
They’re all bikes though, and ultimately a well designed frame is far more preferable than a badly designed one, regardless of wheel size.