the balance between quality and price is struck when you guys log on here. for the new guys, speak up and ask questions. for the more experienced folks, pass along what you've come to know. the free exchange of information is the great equalizer!
there's nothing wrong with considering an inexpensive chinese RC engine if you're thinking about trying out Giant Scale RC. But ask about the particular one you're considering as they aren't all the same, most suck but there are a few worth trying as a first big gasser. same with planes, electric motors/ESC's, servos, batteries, radios, etc.
ask the folks that have been there and done that. if anyone says they all suck, just ignore them. if anyone says buy whichever one you come across first, ignore them too. somewhere in the middle is the answer and from there you can go about getting started.
a lot of people have learned on inexpensive stuff (with the help of some worthwhile guidance) only to go on to more expensive equipment when they were ready. (but don't be afraid to step into the mix and ask a bunch of questions. if anyone tells you to stop mucking up the site and do a search, that's not site policy. maybe get started in the beginners' lounge with the basic stuff but feel free to post new threads asking questions. it's how we get to know each other around here.)
it's all part of what makes the world go round.