Don't be too concerned about the forks, it's the frame and the whole package you want to be considering.
A quick Google search showed that those forks have 63mm of travel, possibly with pre-load adjustment, which would place them as budget suspension forks.
Is the Bike a Claud Butler by any chance??? (they do make some good bikes by the way)
There's nothing wrong with a budget mountainbike as long as you accept it for what it is, cheap, heavy, relatively low tech suspension, and suitable for pootling to work/the pub or down canal towpaths.
If that's the sort of riding you'll be doing then fine.
If you intend on doing any "proper" offroading (ie bridleways, farm tracks, riding in the woods or something more adventurous) then I think you really need to steer clear of the generic budget mountainbikes as they will not serve you well.
Instead look at bikes from the major MTB manufacturers and for a new one expect to pay a minimum of say £200-300 for a decent reliable "proper" mountainbike.
A used bike of say a year or two old (or even one of last seasons old stock discounted bikes) for the same money will get you en even better bike.
Of course as this is the Retrobike forum there are plenty of retrobikes for sale here, and plenty of retrobikers to persuede you to consider one
; although they may be older bikes they are still pretty light, well specced, reliable, and don't cost the earth (mainly)
. Some of them may not have the kudos of full suspension or disc brakes, but realistically do you really
need all of that just to pop down the shops or whatever?