You know your right, I had never thought of troubleshooting it
Here, let me help you blame my ignorance:
1. Just works- because you told me so- proven by your machines functioning perfectly. I am also sure you are utilizing the same environment too.
2. Don't do the upgrade, do a wipe a new fresh install only- got it!
3. Don't worry about SMB or Networking drives no one needs em.
4. Back to my mac, well your milage may vary.
5. Don't upgrade, do a fresh install- Check, check, and re-checked.
6. Make sure you are running all apple gear, go out and buy all new fresh routers so that nothing at all can point the finger at Lion. Well, that's kind of expensive to replace my 2 Airport extremes and 2 airport expresses- are you sure?
7. Don't use it with a windows network in finder anymore.- I kinda need that functionality though

8. Please don't attempt to connect to any WebDav protocol drives unless you have a few minutes for a time out. Well, I can be patient.

9. Unless you rely on IMAP (really, who does that) don't expect a good experience. I know, use Gmail, that will solve all your problems. My company does not allow it, now what?
10. External monitors, ha- get rid of em.

11. Safari, oh that's where my ram went.

12. Finder is sorted wrong for your needs? Tough

13. Not running as good as SL- must have done something wrong, user error, must have been broke before, did you wipe your brand new SSD and do a fresh install? Reinstall, must have done something wrong...

14. User error, everyone knows that
15. Make sure you do not add any new microwave ovens, toasters, home phones, or heaven for bid build any walls after installing Lion.
16. Want to try Airdrop? Go replace the other 4 macs you own first.
If your running a business, and need to actually get work done you might want to stick to SL.
* For the record, I really do hope it cleans up soon though because the upgrade will be forced upon us at some point in the near future.