Dwight D. was a fairly decent President for his time (by my estimation anyways), though his administration did have some clear negatives about it.

Just for a few of the major negatives I can think of off the top of my head, Ike really failed at promoting civil rights in America, and did not do much to support the Supreme Court decisions related to that hot-button and very important issue. As an example, the 1954 Brown v. Board Of Education decision from the Supreme Court (related to the desegregation of the public school system) was met with a less-than-enthusiastic response from Eisenhower and his administration, with him only rather slowly and seemingly reluctantly choosing to demand the enforcement of the new law of the land when the rather blatantly racist Governor of Arkansas (Orval Faubus), called in the National Guard to defy the Supreme Court ruling and prevent black kids from attending "white" schools. Ike's civil rights record was less than stellar - though not completely terrible I must say given the period and the prevailing mindsets at the time, particularly in the South, though he definitely could have done a heck of a lot better, and America would be better for it today had he put more positive effort into that very important national issue back then.

Eisenhower did little to stop the spread of "McCarthyism" - which was the (to put it simplistically) primarily communist witch-hunt imposed on America by Wisconsin Senator Joseph McCarthy. "McCarthyism" can today be defined as the practice of making accusations of subversion or treason against an individual without proper regard for evidence (it took place during a period known as the "Second Red Scare" in the early days of the Cold War with the USSR - from about 1947 to 1956), and ended up destroying the lives of many thousands of innocent people who were targeted in the rather ridiculous, and many times unfounded, witch-hunts. Eisenhower even went so far as to endorse McCarthy for reelection in 1952, showing what can only be interpreted as his support for the quite abhorrent behavior of McCarthy.

Eisenhower also signed a bill that put the term "Under God" into the Pledge of Allegiance, and that clearly religiously motivated political move set off a huge legal "Church vs. State" issue that continues to be debated to this day in many places. He could have left well enough alone there without much of a problem, but decided to stick his nose into it in order to try to please a certain rather vocal religious right portion of the electorate.

Ike also left the nation of Hungary hanging out to dry when, after pushing them to revolt against the Soviet Union under the ideology of "brinksmanship" (leading to the Hungarian Revolution of 1956), did nothing to really support that nation when the citizens did revolt.

Eisenhower's Administration also played the predominant role in Iranian politics, using the CIA to overthrow the legally elected President of Iran - Mohammed Mossadegh - and installing the more American/Western-friendly "Shah of Iran", Mohammad Reza Pahlavi, who turned out to be one hell of a brutal dictator (and many say an "American puppet"). The Shah of Iran murdered countless thousands of his own people during his multi-decade reign, primarily using his SAVAK national intelligence agency and troops to quell dissent, violently and without legal regard culling those who opposed him from the Iranian population. That eventually led to the overthrow of the Shah in 1979 with the Iranian Revolution and brought on the rise of guys like Ayatollah Ruhollah Khomeini, which turned the Iranian government into a hardline radical-supporting Islamic theocracy.

Those are a few of the negatives I can think of that can be attributed, in large or full part, to Eisenhower's terms as President.