[quote=Green]
Then some guy with a magical anti-armor bazooka walks up to it and kills it dead with a few shots, because it can't dodge for shit. If you find a way around that, I'd agree that tanks could be viable.
[/quote]

I could use the same logic I've seen in this thread thus far (especially in regards with the notion of 'bullet dodging') and say that the tank simply dodges the rocket, or it could shoot down a slow-moving rocket with its hard-kill defense systems, nullify the round using its ERA (electrically-charged reactive armor), or it can simply hide from the round using its stealth systems (these technical attributes are actually all either present on current fourth generation MBT models, or have been retrofitted to existing third generation MBT models, or they've been planned for installation on future or current MBT models). 

The tank then returns fire using its hit-scan weapon.

A successful attempt at dodging said attack will be met with claims of powerplaying, as you've deliberately placed your character in a dangerous situation for seemingly zero reason whatsoever and thus deserve to be incinerated on the spot. 

Ok well, not incinerated, but damaged. We don't want auto-kills here.