Asymetrical Routing

I've been investigating a problem we seem to be having with asymetrical routing. We have connections from both UUnet and Digex and are taking full routes from both. We have had some complaints that people are unable to access our network and most of these cases appear to prefer the Digex route. However, our outgoing paths to those same networks prefer the UUnet route. My question is: How bad is this? Is it terminaly bad or simply not so great? Out of order TCP packets are bad, but can simply be reassembled. Timout should not be a problem as both links are >= 6 Mbits. Thanks, --Jayme