By pressure, I mostly mean time pressure:
I have pretty low confidence when he has to run a 2 min drill. He does fine when he has plenty of time to setup things, but he doesn't manage time well. The number of TOs we use when we run out of play clock is another indicator of that.
In play adjustments. When he gets to the LOS and someone has a defense setup too well for the play call we have (i.e. overload blitzes), he doesn't adjust that well to them. No changing protections to cover the extra person, no getting a receiver into a vacated area or hot route. He often seems surprised by blitzes getting on him right away...some of that is the OL not playing well, but some of it recognizing you are in trouble by the look you are getting on D.
His interceptions tend to come in one of two fashions: a tipped ball (not his fault) or a REALLY bad decision when he gets surprised by a blitz. He just needs to know that certain times, you need to throw the ball away or just eat it. This isn't a huge problem for Love, but just another indicator that he isn't a great "think on your feet" type QB.
Love is HOF good when he has plays setup and time to throw - the clean pockets. But the ability to improvise and handle a lot of things at once just don't seem to be his strengths (i.e. where good QBs become HOF QBs).
I'm going to stick my neck out here and say that MLF makes Love look good (i.e. mostly good play calls and scripting WRs/TEs open for him), but Love makes MLF look bad with the lack of on-field adjustments and time management.
I'm not saying MLF is perfect, but I think a lot of the complaints we have about him are more on Love.