I started hating M********* when I was very young. I was given some along with a pile of Lego. The M*** parts just didnt stick together well, and I quickly begun to form my opinion which still holds to this day.
Honestly, I have drooled over cheaper ships, and military sets/parts that Lego just has never had/never will? (despite the subtle increase in "violent" themes and sets) Seriously, TLG should have a line of realistic military vehicles. (Like nearly every other toy company on the planet does.)
But, I have stayed with Lego only because of the quality of the bricks and figures.
So, M*** can design some cool dragons, but their sets will just fall apart.
As far as other "clone brands" I suppose I have been scared away from them because of my experience with the M***, so I have not tried most of the others.
If you want cheaper quality bricks, then it is totally up to you. Go for it.
(Remember, you get what you pay for.)