1: If you're using Axes, this skill is pretty much required. For Maces, not quite. If you mainly use Maces, leave it at whatever level (can't remember if it's a pre-req for anything). Max it anyway, because Maces don't have perfect size mods on Small targets, for instance.
2: You have to max it for Maximum Power Thrust (which is an amazing skill for any build that isn't using a Mado, and great for training as a Mastersmith). Max it anyway - the attack boost might not be too noticeable but every little bit helps.
3: Only really useful for ASPD attacking, the SP drain is too much for skill use. If you are ASPDing, though, max it.
4: Only max it if you want High Speed Cart Ram. HSCR is a good, but fairly expensive (3k Zeny per successful hit) skill. Good back-up if you lose your Mado against an MVP, though.
If you're not going forging you'll find there's a LOT of spare points for Mastersmiths.
Edited by MrTyranitar, 19 February 2013 - 03:13 AM.