I never buy a comic if the cover has been drawn by a high-profile 'superstar' artist and the interior is by someone else. If the creators have felt they need to try and dupe people into buying it, it probably isn't worth my time (or precious shelf-space!).
case in point: Maplestory. the adverts are as flashy as some Dragonball Z scenes-but the actual game? it looks more like the original Super Mario!
The only time that this wasn't the case was with the SW Darth Maul comic trilogy
Holy fuck, the covers suck ass