Whats wrong with Foundry Networks?

I've seen on this list, and from many other places a generic hatred for Foundry -- with comments like "It's IP stack is just plain broken". Whenever I ask people for specific examples, I get none. Now, I have seen plenty of bugs in Foundry -- but all in all, I think Foundry BigIron is the best router you can get, given the price. I am now using BigIron 8000's to do most all of what I used to have 6509's doing, and I haven't regretted the decision to switch for one second (I did use a mix of foundry and Cisco before -- and regretted the decision to include Cisco at all) Anyone care to share why they feel Foundry is inferior? --Phil