Diablo 3 is fundamentally broken

[Chesspiece_face]

Spiderlings anything is ridiculous for casters. They're too fast to kite, and do lots of "small" damage (the small being relative), where Wizards are built to take a few large hits. Mortar is better than pre-1.0.3, but in the process they bugged it out. Near corners you can get hit by it at point blank range - like walls are cutting into the minimum range for it.

This isn't new. Mortar would always bug out near walls. Pre 1.03 if you stood near a wall and a Mortar enemy was in melee range of you it would fire it's Mortars at the wall and they would all land on you point blank. It's possible that the 1.03 changes exacerbated this issue, but it was always there.