Yes, they can be quite tasty too although the flavour is quite delicate and easy to ruin. Anything above 6lbs live weight will be more fish than even quite a large family would be able to eat in a sitting.
Needs careful preparation as they have an unusual skeletal structure which includes a free floating 'rib' which sits between every flake of flesh - called a pin bone. They're a nightmare to remove!
The belly flesh tends to be very thin and not worth bothering with but the back is two long, thick strips of muscle which run the whole length of the fish. Stillwater pike tend to be quite slimey, newspaper is about the best thing I've come across for removing it, if you're handy with a filleting knife skinning the back fillets is best, easy too as the skin tends to be very thick for a fish.
The French have long abandoned pike as a filleting fish and cook them as a sort of fish cake come dumpling called a quenelle (quenelles de brochet being pike dumplings) made from the shredded and sieved fish after it's been poached.
There are ways to debone a pike other than pushing it all through a sieve but they tend to be quite wasteful of the fish - if you're not averse to picking the bones out as you go along they're a fine eating fish provided you don't over flavour them. If you're fishbonephobic, definitely look elsewhere!
Cheers,