Sheet chokes are very open chokes. As such, they're ideal for short range shooting - they produce a well saturated pattern at about 25 yards. This makes them well suited to short range target sports such as skeet, or for short range game situations such as wingshooting in dense bush conditions.
I wouldn't be too enthusiastic about doing any hunting with skeet/skeet chokes, though, because you don't have a barrel choked for anything much beyond 25 yards. I consider it likely that longer shots would present themselves, even in tight situations. I've never tried doing so myself, but I'd imagine that skeet chokes would work well for snipe hunting, which tends to be short range and can benefit from good patterns close in.
In my opinion, skeet chokes are wholly unsuited to trap shooting or pheasant hunting. Trap shooting is best done with at least 30" barrels and a combination of full and modified chokes. This is because in trap your first shot will usually be at roughly 35 yards and your second shot (if required), at considerably longer distances, depending on how quickly you can adjust and fire off a second shot.
Pheasant hunting usually presents a combination of close and longer shots. It's possible to have limited success pheasant hunting with skeet chokes, but it could be extremely frustrating. Besides having gaping holes in your patterns for all but the closest shots, you also run the risk of injuring birds and not making clean kills. Pheasant are tough birds and one or two pellets are seldom enough to bring one down. Once on the ground, they make amazing use of cover and are difficult to locate unless you have a dog to help locate them.
(I once was baffled looking for a pheasant that my dog insisted was there. Eventually I figured out why I couldn't find the bird and why it didn't break cover with me so close by. Turns out the pheasant was so well camouflaged that I was standing on it's tail without realizing it was even there.
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