My apps have this loading screen > insterstitial ad > content.
the reason is clear. some people think that they need to press the screen when you show your loading screen to get further which might lead to accidental clicks.
try to reduce loading times by just creating what's needed for the initial menu and it will start up fast enough to remove the loading screens.
an interstitial ad at app load ain't professional looking either and it might distract the user from your app to install or check another app before they even tried yours.
let them use your app/game first and then show some ads.
if you look at reviews from apps/games that common phrases list always shows complaints about ads so if you want to hold your users you better not flood them with ads.
also as written in one of your earlier threads make sure you preload and just call the show when needed.
don't use the load and show on adreceived or you will keep getting problems with admob as you don't have control on how long the loading times are
and ads pop up when the user is already playing or using the app again after the dialog meant to initiate interstitial show.