Well,theres a few major factors to look at.... But I'll just cover 2 'cause I don't want to be here all day...
Popularity: Gaming popularity has skyrocketed over the past... lets say decade, so as with anything, lets say motorsport, started off a few hardcode petrolheads who wanted to race their cars for a laugh, that got more serious, they got a couple fo people down to watch, and a few more, and a few more, and a few more, then they wanted a go at it themselves, and a few more and a few more again, and now we have idiots crashing their piece of shit cars to try and look cool and impress women pushing the initial insurace for new male drivers up to ridiculous levels (side rant over)... Lets apply the same principals to gaming, there are those of us, who genuinely care and enjoy our medium, like a big communal garden, a couple of guys started it, a few more came to chip in and do their bit, and now it's grown so big, we've idiots running around the place kicking whatever they see.
MONEY: It aaaaaaaaalways comes down to money, as much as I would like to say "I want to make a game with a loyal and mature fanbase" that isn't a great business target, because "loyal and mature" means relativly small. Whereas if I say "I want a game that sells" I will make something like say, Call of Duty, or World of Warcraft, something conceptually simply, easy to grasp and more addictive than crack. I mean think about it, if you and a team of co-workers are putting X years of your lives into making a game, you want to make that worth while right? how would you feel if you poured 5 years of your life into making a crazy intuative, revolutionary game, but only a few people actually got it, and it got dismissed by the people to ignorant to get it and you end up just scraping by (if you're lucky)? So you make something that doesn't push too many boundaries and sticks to a similar formula to everything else out there.
But to answer your question, yes, on average, they are, simply due to the influx of "casuals" and "internet scum" who simply dont' care, caused by the popularity increase. But the core of 'true' gamers, like the vast majority of users here, has if anything got more intellegent, we've all grown up thinking we could do things better, or differently and some of us have had the chance and succeded, look at Notch and Minecraft,and all the creativity that has came out of that, or all the insane mods for Kinect, or even guys like Freddie Wong on Youtube, all gamers.