You make it sound like Tulane or ULL werent good teams. You really should at least have a small knowledge about the game if your going to talk about it like an expert. All the selections are based on auto bids and RPI.
Cal state fullerton, Witchita ST, Pepperdine, Stanford....all have been to the CWS pretty regularly with some national championships too. Oh don't forget about Rice either.
Here is the format...
64 teams; 16 regional sites with regional hosts who are typically a 1 seed but can be a 2 seed in a 4 team double elimination tourny. I cant think of a single 3rd seed host,ever. The TOP 8 in the country get to host the "Super-regional" round ( asuming they win their regional) which pairs the regional winners in a best 2 of 3 series. At the CWS..double elimination 2 bracket tourny format till the 2 winners meet in a best 2 of 3.