I've used Tmax 400 (4x5) and thought it was a horrible film. I was sort of desperate at the time, and wanted to buy some B&W film, but the local photo place only had 400. I found it to be washed out and not very contrasty...as well as very grainy
Emre, TMax 400 certainly poses challenges, but it's also capable of producing excellent results if handled properly. What you've reported sounds to me like the consequence of exposure and/or processing error, not some problem with the film itself.
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