You're not alone
I really liked it at first because it was cheap and looked like it would fly really well....which it sort of does.
Its no glider...thats for sure and knife edge flight sucks but theres no real fuse area for it to fly on so I guess its to be expected. After flying it for a while I really don't like the lines it takes when turning and some other aerobatics.
I did find that once I pushed the CG to the outer limits it was much improved though. You might try that first....it made a dramatic improvement for me.
The sig is a way better plane...I don't think anyone will debate that one with you.....but you get what you pay for generally.
After about 80 flights on mine I am still torn about it. On the one hand its small and cheap and low risk and on the other hand it could be a better flyer but I also don't dive down from 200 feet and pull up at the last minute with my DP extra so I'll probably keep it.
T