This was already discussed a few years ago, but I am bringing that matter again: I think Hammer should be banned in 1v0, for the following reasons:

• Hammer gameplay in 1v0 is fondamentally uninteractive because she will just not interact with minion waves, camps, or even structures, besides hitting them. That means there isn't much to optimize and no strategy to develop, which make the runs rather uninteresting.
• Hammer is the best hero on all maps that have neither strong camps nor strong objectives. Maps such as Warhead and Volskaya could allow interesting strategies with Vikings for example, but since Hammer is faster, there is no point. Banning Hammer would allow those strategies to be developed.
• Most of the maps where Hammer isn't the best are quite similar to each other: Garden, Temple, BHB, Dragon Shire are all about the easy camps, for example. It would be good to bring up new maps with distinct strategies.
• Even though it turns out that the best strategy on those maps is to take a good pusher and just hit structures, the fact you need to interact with waves inherently allow more optimizations that Hammer runs.

Looking forward your thoughts on the matter.