If you're new to basketball, then you're lacking many, many years of experience, decades of experience. And the last thing you should be doing in using some eye test to judge players. That's what most teenage types do anyway. I've seen them use the eye test to say that And1 players are just as good as NBA players, they just don't go to the NBA because they are passionate about And1. For the average human, the eye test is just going to make their favorite players look like one of the GOAT, and their most hated player, just a scrub.
Centers have a bigger defensive impact when compared directly to wing players, but the advantage they give their team relative to those wing players depends on how their impact compares to other centers, not wing players.
For example, Shaq's team realizes no ADVANTAGE when his defensive impact is matched or exceeded by the opposing center.. This happened more often for him than it happened for MJ/Pippen/Lebron, since they ranked at the TOP of their position defensively, while he didn't - Shaq only achieved three 2nd team all defense in 17 years (no 1st teams).. So on average, perennial 1st team defenders like MJ/Pippen/Lebron gave their team a bigger advantage in defensive impact over the opposing wing, then Shaq's advantage over the opposing center, which means they provided their team with a bigger defensive impact.
Here's an example - look at the Ray Allen vs. Jordan DPBM comparison (-1.3 to Jordan's 1.1) and then look at Ray's teammate, center Ervin Johnson vs. Shaq (2.6 to Shaq's 1.6).. Now who provided the greater defensive impact to their team?????. Again, Shaq's team realizes no ADVANTAGE from his defensive impact anytime it's matched or exceeded by the opposing team's center.
Btw, I used the defensive boxscore stat to measure defensive impact because the verbage "defensive box score" makes it easy to conceptualize the advantage in defensive impact that a player can provide.. But ANY stat/methodology could be used to measure defensive impact - the main point is that we know elite defenders provided their teams with a bigger advantage in defensive impact over their matchup, then Shaq provided over his.
And the same concept applies to ANY elite defensive player that ranks higher defensively at their position than Shaq, who was not an elite defensive center.
Now obviously, MJ, Pippen and Lebron probably DON'T provide their team with a greater defensive impact than guys like Hakeem/Robinson/Mutombo - those guys were elite at their position AS WELL, and likely held a greater advantage in defensive impact over opposing centers than MJ/Pip/Lebron held over opposing wings... But not Shaq - Shaq was NOT an elite defender like Hakeem/Robinson/Mutombo, so he didn't have a larger advantage in defensive impact over opposing centers than MJ/Pippen/Lebron have over opposing wings.
Shaq was lazy with poor work ethic and only made three 2nd team all defense in 17 years (no 1st teams).. Consequently, his teams were never great defensive teams - they ranked in the league's top 6 only 1 time in 15 years thru his Miami days, and top 10 only 7 times in 15 years.
There's no guarantee that if you drafted Shaq over Jordan, your team would be better defensively - infact, it's the opposite - Shaq's teams were far worse defensively over the course of his career than Jordan's, even though Shaq had all-pro defenders Eddie Jones, Kobe, Wade and Horace Grant (in 1995 and 1996).
He also had Alonzo Mourning in 2006, who led the Heat bench (2.7 blocks in 20 minutes).. In 2001, his team had the 21st ranked defense despite being stacked defensively with all-pro defender Kobe and other solid defenders like Robert Horry, Derek Fisher, Rick Fox, and Horace Grant (he started every game).