Sure, spend 3x the $$$ and get something better. (incidentally, which Hammerfall system are you talking about? RME? that's a PCI card right?)
But IME, the difference in quality is not much of an issue when you are running it on a large stage with 8 mics on the drums, another 4 on percussion, 3 or more vocal mics, a mic on the guitar amp, and 7 wedges, you catch my drift.
Honestly, I leave the RME at home now, and just go from the 3.5mm jack on away gigs. Having an audio interface built into the controller, though, would be a strong selling point for me. On gigs where they have a Montage/MODX 7 or new Fantom on the top tier, I use those as audio interface, with local off.