Still Affordable Repraps are capable of SUPERB Print quality once set up correctly!
Reprap i2 is capable of printing a wide variety of 3D filaments which is a lot of fun! It's capable of superb quality fine prints with glass-like outer edges not just the base layer IF it's built with meticulous attention to detail and you get your software settings and choice of filament right. Trust those who are giving you Tried & Tested advice or you could waste months and a lot of plastic if you fail to c-a-l-i-b-r-a-t-e your inexpensive Reprap i2/i3 printer to fine-tune it's control. If your machine is well built and there's as little 'play' in components as possible, it's capable of producing prints as good as a printer costing x10 times as much. Tighten down the build plate so it can't wobble around as the B.P. shuffles back & forth; Make sure that your rubber Pulley is taut as this will also help minimise jerky movements/bouncing. Don't "Speed""! The best quality print is also achieved by printing at the Optimum speed for the nozzle.
What's causing Poor Quality Prints? More likely User Error than the Reprap's Fault;
I'd battered my Repap to bits & rebuilt it dozens of times before I got a print out of it! The Tech Sheets that came with it were extensive but the best bit of advice was to keep your hands OFF the smooth & threaded rods. As they say "Wear the glove". You must maintain the steel rods by application of light lubricant eg. sewing machine or brass instrument valve oil. This'll keep them moving freely & prevent build-up of oxidisation (rust) which leads to the printhead carriage or Z-Rods sticking & causing failed prints. 1 tiny drop of oil once every few weeks is enough & will keep your printer running sweetly. When calibrated correctly your Reprap i2 should sound 'musical' as it prints.
For $299 I bought a 3D printer that taught me an enormous amount. I have no time for those who patronise China's Manufacturing. What I received from them was amazing; I've had superb fun striving (even crying) getting my hardware perfectly assembled, Software, Dependencies & Drivers installed, achieving calibrations and so much more but I didn't set off to buy everything working "out of the box". This was The Plan. Going from a box of nuts n bolts to a machine that can 3D print a plastic lidded box in 35mins has been an awesome journey and one I will never regret taking with a Reprap i2!