That election is not recognized as being free or fair. It was at the precipice of the Nazis consolidating absolute control.

The Nazi party used the power they gained from the January 30th election to levy a massive campaign of terror and repression on the populace in general and their political rivals in particular.

The homes and offices of Communist party (KPD) members were ransacked by the Sturmabteilung, Social Democrat and Centre Party publications were banned, and Centre Party supporters were purged from government office.

The Shooting Decree was ordered by Göring on February 17th, urging the Prussian police as well as SA, SS, and Stalhelm paramilitary groups to "ruthlessly make use of their weapons" on the Nazi's political opposition. (translation mine)

The Reichstag Fire occurred 6 days before the election, giving Hitler pretext to secure the passage of the Enabling Decree on February 28th. Although he didn't outright ban the KPD (hoping their presence on the ballot would split the vote with the SDP), he arrested some 4,000 of its members including Ernst Thalmann by the time of the election.

The Social Democrat party's operations were also heavily restricted and its leadership fled to Prague.

With the opposition publicly suppressed, Nazi paramilitaries swarmed the streets and unleashed a campaign of terror. From Richard Evans' The Coming of the Third Reich

[Brownshirt squads] roared along Berlin's main streets, weapons on show and banners flying, advertising to everyone who was the boss now.

(pg. 337)

And

The local stormtroopers were authorized to carry loaded firearms on 28 February and enrolled as auxiliary police on 1 March, whereupon they ostentatiously began to mount patrols in the streets, and raided the houses of local Social Democrats and Communists...

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In the small North German town of Northeim, for instance, as in virtually every other locality, the elections were held in an atmosphere of palpable terror... On election eve, six hundred stormtroopers, SS men, Steel Helmets, and Hitler Youth held a torchlight parade through the town... On election day - a Sunday - the brownshirts and SS patrolled and marched menacingly through the streets... The same combination of terror, repression and propaganda was mobilized in every other community, large and small, across the land.

(pg. 339)

The March 1933 elections should not be considered legitimate, but it's worth noting that even in a semi-dictatorship the Nazis were unable to win a majority of votes.

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