do u have a pic that the exposure is nicely spot on one? if have..load into the cam..on the LCD...set the LCD brightness and leave it as that...then trial n error use an assortment of materials cover the LCD and see if the pic looks too bright/dark/just nice on the lcd...a bit low tech but may work..hehe
best way 2 check exposure is not via lcd review. use the histogram. never trust wat u c in the lcd display. colors n exposure may look nice but in actual fact it could b different.
if u really need something 2 aid in viewing under glare, there's this hood thing dat attaches 2 the screen. it can b extended out 2 create a small "tunnel". u can then peer thru it at your lcd. its called a hoodman or something. can't remember though.