Ruger and Buckmarks are the gold standard for .22 auto pistols for the masses. They're simply a great value, having said that, I have a Walther P22 and I think it's a good gun for plinking, in fact , a GREAT gun for plinking. I wouldn't use it for squirrel hunting but it looks good and mine functions well with most ammo and absolutely perfectly with CCI Mini-Mags.
The real advantage? I fits my hands well but it also fits my children's hands well. I've introduced my 8 year old to shooting and she loves it becasue this gun fits her. All of my children would struggle to grip a Ruger or Browining.
Also, some of us tend to buy better quality arms and talk about passing it down to our children. My P22 is just a cheap plinking gun and that's it. I didn't pay much for it when I bought it about 4 years ago or so and I got the kit model that also came with a 5" barrel. So it's made of pot metal. That does lower it's value and it's cost. Mine has a gazillion rounds through it and never had a problem. Drop it on concrete and it may crack the slide, I don't know but I do know I've already gotten my money out of it.
A friend has two identical Ruger's that have slapsided barrels and both have beautiful wood target grips with a neat thumb rest. One of them shoots everything and anything all the time. The other seems to know if you bough your .22's in a "brick" and hates them all; it likes stingers or CCI-Minimags. He gave that one to his wife
Since this isn't a serious self defense or hunting gun, I wouldn't hesitate to get one. I don't believe it'll be a bad deal.
I do think if you can save up a bit longer and get the Ruger or Buckmark that you will be more satisfied in the long run but I don't think the Walther is as much a piece of junk as some seem to think. With a red dot mine is very accurate as well.
God Bless
Gideon