I have to admit to being an old hand with FS2004 and an even older hand with the Alps. Yes, the PMDG 737 is where it's at, with no near competition. It does depend which terrain mesh you use, but nonetheless, it is fun even with the default.
Try this little lot in the 737 (even the default) and you will enjoy. No, I am not going to fire it up to give you the missing ICAO codes, but these are all Alpine pearls and you can do them all sequentially.
Mollis (LSMF)
Interlaken (LSMI)
Ambri (LSPM)
Innsbruck (LOWI)
Samedan (errrr)
Buochs (errrrr)
Saanen (errrr)
St. Stephan (errr)
Courcheval (no - just don't bother - even in the Cub)
try knocking the weather down to to ten miles vis for starters. I promise, it will make you concentrate. If you see any fins sticking out of the hills, a fiver that it belonged to me. Nice thing with the PMDG 737 is that if you decide to trust your bowels, the go around is as nerve wracking as finals.
Do enjoy....
PS PMDG 737 - do land at a sensible weight. Otherwise, you will be screwe..... Sad innit? Enjoy!