Ignore anything that it said on here until you have tried one.
I have had 5 29ers and love them for local twisty singletrack.
As for slower acceleration, climbing or otherwise, that is total bollards too.
Not so nimble? again I disagree. I find a slight riding style has to be made, but I have not noticed a credible difference.
Mine is reasonably light too at 24lb, but it is a real bike without gears or suspension.
If I could afford one I would probably get a 29er FS, but I can’t so will stick to 26″ bouncer and 29″ SS Rigid
Some like them, some don’t. Suck it and see