I’ve heard some things about that.
I’ve recently started messing around with Game Maker. It’s not really a “maker” though, it has its own programming language which is geared toward game developing with many useful functions for that. For the newbies it has this drag and drop icon system where you can easily start using some of the functions but for the full effect you need to learn the Game Maker Language (GML).
It has some 3D functions but it’s geared toward 2D games (of course, isometric is 2D).
I guess if you just want to make RPGs then an RPG maker is your best bet if you can’t be bothered with learning how to code etc but if you just want to get into proper game developing I think Game Maker is the better choice.
Only one thing, some rather useful functions are only available in the registered version but it’s very very cheap and definitely worth it in my opinion.
You can always try out how it is before forking out the cash, many types of games are more than simply possible with the unregistered version.
The community is helpful for the most part too.
I suggest you download it and then do some of the first few tutorials found on the website’s tutorial section. The first game, the shoot em up and the platform examples are enough to get the mentality of it I suppose (and none of them use actual code, only the drag and drop system).
Don’t expect to be making an rpg (or anything with complex aspects like the experience and skills systems etc) without like a year of experience in GML or something close to that though… Unless you are already familiar with programming that is.
GameMaker.nl
PS: By “you” I don’t mean you lagi, just anyone, I know you don’t have the need for a maker or any easy programming language 
PS#2: Clickteam’s MultiMedia Fusion (or MMF) is supposed to be a good and relatively easy game maker (not geared toward a particular genre) which includes advanced actions like Game Maker and is quite popular but its price (I think over $200) is not really in a range that can be directly compared with Game Maker. I tried the company’s lower end product, The Games Factory (trial version), and it didn’t seem to be what I was looking for, while working with Game Maker has been fun so far though I don’t get to work on it as much as I’d like to.