As a DM I've found that it is very easy to ruin a warlock's spellcasting abilities with opposing casters. The low number of spell slots per battle with the short rest spell recovery mechanic makes spells such as counterspell and dispel magic hit them harder than other casters in key battles with enemy casters.
One powerful combination one of my warlock players has been using is the darkness combined with devilsight to create a situation like the advantage of greater invisibility. This combination seems powerful, but even a relatively low level opponent caster with 3rd level spells can cast dispel magic eliminating this advantage with no roll, while at the same time taking away half the warlock's spell slots for that encounter.
It seems that countering or dispelling a warlock will reduce them to eldrtich blast for many key fights making them an impotent spellcaster against spells "long rest slot" casters. What is the experience of other DMs and warlock players? Is it to easy to counter warlock casting abilities rending their spell casting ability impotent? Or do they seem able to use their spells effectively in a battle against opposing casters?
One powerful combination one of my warlock players has been using is the darkness combined with devilsight to create a situation like the advantage of greater invisibility. This combination seems powerful, but even a relatively low level opponent caster with 3rd level spells can cast dispel magic eliminating this advantage with no roll, while at the same time taking away half the warlock's spell slots for that encounter.
It seems that countering or dispelling a warlock will reduce them to eldrtich blast for many key fights making them an impotent spellcaster against spells "long rest slot" casters. What is the experience of other DMs and warlock players? Is it to easy to counter warlock casting abilities rending their spell casting ability impotent? Or do they seem able to use their spells effectively in a battle against opposing casters?