The year 1994 was a creature unto itself, of course, a reversal of decades of Democratic leadership. The Democratic win in 2006 and the Republican dominance in 2010 and 2014 were different orders of magnitude.
Nonetheless, 2014 was still unusual in the extent to which people remained skeptical of the new leaders. Breaking it out by party, you see that the party that assumed control (Republicans, except in 2007) has grown steadily less confident that the new leaders are fulfilling their goals.
The second graph below shows something different, though. It compares the new majority and new minority to the overall attitudes. Usually, the winning party's base is about 20 points more approving of the new leadership's job than everyone in total. Right now, though, Republicans are only 15 points more positive.
What's more this isn't a function of Congress' always-low approval ratings. In the months that the Pew surveys were conducted, Gallup approval ratings for Congress were even lower in 2011 than they are now.
We have a few other theories. First, the House didn't change hands, so the overwhelming victory by Republicans was more subtle in its effects than in the previous two instances. Second, it's hard to say what the overarching Republican campaign promises were. In 1994, you could point to the Contract With America. There was not much of a uniform equivalent last year except opposition to President Obama. He hasn't been ousted, and Pew notes that Republicans want to see their leaders challenge the president more.
Then there's a third option: People are sick of Congress and members of Congress to the point that they're tired of their own team. It's only been four months, and it's not clear what we were to expect in that time period. But if your default position is that Capitol Hill is full of bums, you're probably unlikely to be generous in assessing their job performance.