Lets look at what we are actually talking about here since we are seeing yes and no, this is probably a DM discretion area.

So if we take our weapons and convert them to Large/Huge stats are as follows....

GS 2d6->3d6 8lbs->16lbs 50gp->100gp

BS 1d10->2d8->3d8 / 6lbs->12lbs->24lbs / 35gp->70gp->140gp

Here you can find the rules for such conversions.

So overall, they don't seem to horribly broken from one to the other, a big thing to take into account being the rules of over-sized weapons

Inappropriately Sized Weapons: A creature can't make optimum use of a weapon that isn't properly sized for it. A cumulative –2 penalty applies on attack rolls for each size category of difference between the size of its intended wielder and the size of its actual wielder. If the creature isn't proficient with the weapon, a –4 nonproficiency penalty also applies.

So in reality its a cumulative -2 for each size category above intended. All together that looks like...

• -2 large

• -2 Huge
• -2 Two handed Weapon

Overall -6 bonus (then again only if the DM allows for a Huge weapon to be used Two Handed, as the rules state clearly only one size category, however this is a pretty small thing to fudge)

Lets look at what we are actually talking about here since we are seeing yes and no, this is probably a DM discretion area.

So if we take our weapons and convert them to Large/Huge stats are as follows....

GS 2d6->3d6 / 8lbs->16lbs / 50gp->100gp

BS 1d10->2d8->3d8 / 6lbs->12lbs->24lbs / 35gp->70gp->140gp

Here you can find the rules for such conversions.

So overall, they don't seem to horribly broken from one to the other, a big thing to take into account being the rules of over-sized weapons

Inappropriately Sized Weapons: A creature can't make optimum use of a weapon that isn't properly sized for it. A cumulative –2 penalty applies on attack rolls for each size category of difference between the size of its intended wielder and the size of its actual wielder. If the creature isn't proficient with the weapon, a –4 nonproficiency penalty also applies.

So in reality its a cumulative -2 for each size category above intended. All together that looks like...

• -2 large

• -2 Huge
• -2 Two handed Weapon

This makes using a Huge Bastard sword -6 bonus

Your only really adding a potential for 2 more max damage, and adding a -2 bonus, when compared to using the rules as intended for a Large Great Sword

(then again this is all ONLY IF the DM allows for a Huge weapon to be used Two Handed, as the rules state clearly only one size category, however this is a pretty small thing to fudge)