Warsaw just seriously underwhelmed me after Germany and Krakow
This is a valid point. The two cities are very different. Krakow escaped WWII relatively unscathed and therefore retains much if its historical charm, Warsaw was not so fortunate and is much more modern outside of the rebuilt old town. However, one should consider that cities are not there for foreign tourist indulgence but rather places where the natives live and work and the country operates. As such, Warsaw is an incredibly vibrant and dynamic city, constantly brushing aside the shackles of its past. The food, drink, art and other cultural aspects are flourishing and makes places like Krakow look very staid in comparison.
As much as I enjoy Krakow I find Warsaw far more exciting and interesting, you just need to look beyond the facade a bit more and acknowledge that places, particularly capital cities, do not exist as some form of touristic theme park but rather as constantly evolving and exciting places. Not only that but Warsaw has some of the best restaurants I've eaten at, there's a palpable buzz about the city and this is reflected in many of the new and up and coming eateries popping up everywhere.
I love both cities but they're very different. The fact that I've been to Warsaw more times than Krakow speaks volumes.