Well it's that, also all of Vlad's spell ranges are within Drain's tether, so Vlad has to walk out of his own ranges to break the damn thing. Pound for pound, Fiddlesticks's Drain heals for more than Vlad's Q's can. The only thing Vlad has going for him in regards to this is to employ the same strategy when facing a Ryze or a Swain. They'll always outtrade you, so force near-fatal trades, heal up, and wait till they run out of mana.
However, because Fiddle is mana-based and likes CDR, Morello's is a very attractive item on him, especially against Vlad.
Vlad being caster-based, gets completely ruined by Fid's Silence, and 2.25 seconds of Fear isnt fun for anyone. Vlad also has no hard cc, so he doesnt have an option to solo-cancel Crowstorms channel.
Vlad's greatest strength (which a surprising amount of people don't realize) is his consistency. He will never run out of healing, and this is something I touched on before the details of the MYMU were revealed. Swain, Fiddlesticks, and even Ryze heal better than he does; until they run out of mana. Vlad will never run out of mana, and as long as he has health he'll also never run out of damage for Tides of Blood (which hits like a truck when full build).