Depends; the way you have it worded, nope, you are incorrect.
To hit is determined as follows (from Jarulf's Guide: Battle -- Melee versus Monsters):
FTH = 50 + Dex/2 + ToHititems + clvl + bonusplayer - Acmonster - penaltyquarter damage
So, there is that -Acmonster you have to contend with.
A Bloodknight in Nightmare difficulty has 135 AC; in Hell diff it's 165.
So let's suppose your level 22 rogue has Dexterity 150 (some lups to Dex, some +dex items) and is meleeing a Nightmare Bloodknight with a vanilla bastard sword.
FTH = 50 + 150/2 + 0 ToHititems + 22 + 0 bonus - 135
= 50 + 75 + 22 - 135
= 147 - 135
= 12% final to hit.
Not so hot.
Better than 95% to hit is fine versus a creature with 0 AC, but even the Mage-types in Nightmare and Hell difficulty have _some_ AC.
Someone else in the days of the old DSF claimed the following maxxes (for warriors, I believe):
For clevel 30, anything over 210% to hit is a waste
For clevel 35, 205%
For clevel 40, 200%
For clevel 45, 195%
For clevel 50, 190%
I dunno if this reflects the warrior's hidden +20% to hit melee bonus. Someone who can do the math can nit it.
Hope this helps some.
Attika
FYI, the formulas for non-melee (bow in this case) attack and figuring to hit are:
if the effect is an arrow, calculate 50 + Dex + ToHititems + clvl + bonusplayer - distance·distance/2
if the effect is an arrow, subtract Acmonster
So again, monster Ac comes into play.
To hit is determined as follows (from Jarulf's Guide: Battle -- Melee versus Monsters):
FTH = 50 + Dex/2 + ToHititems + clvl + bonusplayer - Acmonster - penaltyquarter damage
So, there is that -Acmonster you have to contend with.
A Bloodknight in Nightmare difficulty has 135 AC; in Hell diff it's 165.
So let's suppose your level 22 rogue has Dexterity 150 (some lups to Dex, some +dex items) and is meleeing a Nightmare Bloodknight with a vanilla bastard sword.
FTH = 50 + 150/2 + 0 ToHititems + 22 + 0 bonus - 135
= 50 + 75 + 22 - 135
= 147 - 135
= 12% final to hit.
Not so hot.
Better than 95% to hit is fine versus a creature with 0 AC, but even the Mage-types in Nightmare and Hell difficulty have _some_ AC.
Someone else in the days of the old DSF claimed the following maxxes (for warriors, I believe):
For clevel 30, anything over 210% to hit is a waste
For clevel 35, 205%
For clevel 40, 200%
For clevel 45, 195%
For clevel 50, 190%
I dunno if this reflects the warrior's hidden +20% to hit melee bonus. Someone who can do the math can nit it.
Hope this helps some.
Attika
FYI, the formulas for non-melee (bow in this case) attack and figuring to hit are:
if the effect is an arrow, calculate 50 + Dex + ToHititems + clvl + bonusplayer - distance·distance/2
if the effect is an arrow, subtract Acmonster
So again, monster Ac comes into play.