1. If can only fire twice because the sun is used up after both shots.
2. It can't move, it's a goddamn planet, not a spaceship.
3. Too. Damn. Vulnerable.
4. I'm sure the cost of the thing was at least twice it costed to build the two Death Stars.
5. Death Star was better in every way...except for that damn ventilation...
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Well what did you expect on the Death Star? You can't just bottle up the energy to blow up a planet. That shit needs to vent! Besides, anyone other than Luke physically could not make a successful run. The port is the size of a rodent (rather impressive for a MOON SIZED BATTLE STATION), pushes heat OUT due to it being exhaust, and the torpedoes would need to drop a solid 90 degrees in seconds (i.e. use the force). Its not like an architect or engineer can account for space magic!