If you look at a slew of the recent pardons, the beneficiaries had already pleaded guilty. In those cases, the pardons should be ineligible. I think the most a President could do - should be - give defendants the ability to appeal the case to a new judge or jury. It's wrong and should be corrected! Added it to my todo list
Financially and personally, it's what they do to pressure you into submission. It happens from criminal cases all the way down to fucking family court. It's absurd and it's broken.
I truly believe that almost every single attorney should have to lose sleep at night over how their actions impact others.
Judges and juries are at least superficially removed from that sort of corrupt incentive system.
It is clear that they don't only do that, as that has not been their principal (or even a common) use for most of the history of the pardon power.
It is equally clear, however, that they do allow that; the check on that, like on most discretionary Presidential powers, is the Congressional power of impeachment; obviously, that is not a meaningful constraint when the Congress and the President are aligned on abuses, but the entire point of having separately elected bodies is to make it less likely that things that the public would see as abuses are supported by both political branches simultaneously. (Obviously, the fact that one whole house of Congress and 1/3 of the other are elected at the same time as the President, and that the weighting of the electoral college for the President are a blend of the apportionment to the House and Senate makes those elections less independent than one might want, even before considering the way the electoral structure contributors to partisan duopoly, though.)