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With 27.5 x 2.8" tyres and that slack headtube angle it will definitely be sluggish to pedal around. A lot of people find that plus tyres are nice on a hardtail for adding a bit more cushion, but in deep mud they can float rather than cut through, so can feel a bit slippery.
You might want to upgrade the Guide brakes and NX drivetrain at some point but for the money, they're not bad.
If you're after a hardtail that will descend well in good conditions and aren't fussed about long XC rides, then you could do a lot worse.
Bikeradar did a comparison with a Ragley: https://www.bikeradar.com/features/tech/hardcore-hardtail-head-to-head-ragley-mmmbop-1-0-vs-whyte-905
It's quite an aggressive hardtail. More set up for UK bike parks rather than XC miles. Do you know what components are on it? They will make a huge difference to how good a bike it is.