Depends on what they mean when they're making something more accessible. Accessibility is a desirable thing, as many fan-favorite shows have discovered over the years when their Continuity heavy storylines start keeping new fans out of the show, because watching an episode from the five season is so much gibberish to anyone who isn't already a fan.
If you're making a strong effort to keep things clear and to the point, then it's usually a good thing. It's like the old saying "sorry for the long letter, but I didn't have the time to write a short one". Successfully communicating ideas in the most concise manner is really hard and a lot of the "complexity" of video games is simply people adding new features on top of old ones without stopping to think if there's a better way of presenting this information.
I'll use an example from a game I hate: Halo. First person shooters have been on consoles for about as long as there have been first person shooters, but few were genuine hits. The reason was the complexity of the control scheme was based upon the keyboard/mouse lay-out, where you could always add another key for any additional function. Bungie figured out how to replicate as much of that functionality as they could with a controller far less complex. Granted, it's not a perfect port of the PC experience (I hate the two gun load-out as much as the next person), but it's still the foundation upon which all console control schemes are built.
More recently, we have Mass Effect 3 versus Mass Effect 1. A lot of the complexity in ME1 is meaningless. Unless you really, really love micro-managing gear, the system in ME3 is far superior. Instead of making the player buy a +1 improvement to existing gear, you simply buy the upgrade and it's automatically applied to all affected gear. While ME3's inventory isn't quite as deep, you could easily apply the same technique to armor and biotic upgrades and have a superior system with the same level of depth.
But for most developers, when they say "accessible", they just mean they're copying something that is popular, without putting the necessary thought into it to make it a superior system.