Well, Poland would be treated as a defeated power after the war is over ... The Soviets might just take their eastern provinces. But oh wait that's what actually happened despite them being officially on the victorious side!As horrific as it was IRL this scenario could actually be worse for the Poles...
They might get less compensation from the Germans after the war though. But even there I'm not sure results would have been too different from real history... The idea of weakening Germany by giving Poland parts of its eastern territories dates back to WW1 and I don't think the victorious allies and Soviets would leave Germany within its prewar borders. Certainly, all the 1919/1920 plebiscite areas would be given to Poland even if the Poles had ended up sticking with Germany until the end. The remainder of East Prussia would go to the Soviets as per OTL. The reasons for pushing the border with Germany further west would still mostly hold - a defensible Polish-German border would primarily serve Soviet interests. Maybe Germany would get to keep Stettin/Szczecin. Or it might look like line D or C on this map, giving Poland only upper Silesia, southern east Prussia, and eastern Pomerania.

No seriously I see few ways in which Poland would have ended up worse off by siding with Hitler. Materially they certainly would have been immensely better off without the enormous destruction inflicted by the Wehrmacht in 1939, 1943 and 1944, and the vicious extermination efforts of the SS inflicted on them from day 1 of the war onwards. The war would regardless end up inflicting some destruction but you can look at Finland, Romania or Hungary for examples where the destruction (physically and in terms of lives lost) during Soviet conquest / invasion wasn't anywhere on the scale of destruction inflicted on Poland by Germany.
Morally... well they wouldn't have the pride of having been on the good side in WW1. Maybe no polish pope in the 20th century. The polish posters would have to judge whether that would be better or worse for Poland
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