I've only had performing experience of one - Il Barbiere - but it struck me as being far more than trivial; plenty of implicit suggestions for character development contained in the music, and the drama paced to perfection. The several others I've seen all strike me as real theatre works which come alive in performance, which, when all's said and done is surely what opera is really all about: admittedly they're not all repertoire pieces, but then that could be said equally of many other composers with rather large operatic outputs.

I think Il Barbiere is pretty indestructible - the comedy works so well whatever they 'do' to the production. I've a number of recordings and have seen a few productions in the theatre and on DVD; there's one conducted by Bruno Campanella which appeared on Artsworld, as was, around Christmas:
http://www.amazon.co.uk/Il-Barbiere-Di-Siviglia-Rossini/dp/B000EBEH2W/ref=sr_1_7/202-5913406-5145461?ie=UTF8&s=dvd&qid=1180544024&sr=1-7
which had a suitably Moorish/Spanish feel, and Figaro as a bit of an Ali G character! It also features the excellent Joyce DiDonato. There's also a recent Madrid production:
http://www.amazon.co.uk/Rossini-Barbiere-Siviglia-Barber-Seville/dp/B000BAQ8A0/ref=pd_bowtega_1/202-5913406-5145461?ie=UTF8&s=dvd&qid=1180544235&sr=1-1
featuring Juan Diego Florez, where I liked the production less, but the singing's super. Ruggero Raimondi turns in his familiar Basilio interpretation, which is priceless.
On CD, there's even a performance with Placido Domingo as Figaro, which he does very well, as you'd expect, but unfortunately the Almaviva is Frank Lopardo, whose tenor has a baritonal ring which complicates matters when matched up to a tenor/baritone Figaro. There are still many good things to listen out for, nonetheless.

I have Mosè in Egitto on CD (Raimondi/ Scimone). There's a DVD of Moïse et Pharaon sitting by my TV, well Disc 1 - I'm waiting for the second to arrive in my next rental so I can watch the whole opera in one evening!

Well, I've finally got round to watching Moïse et Pharaon this weekend (having been sent a number of DVDs before Disc 2 appeared) and it's a super opera; plenty of differences to Mosè in Egitto, including a new Act I - the Italian version starts with Pharaoh and co in complete darkness as the first of the plagues has struck, whereas in Moïse this opens Act II. There's also a ballet, very well done here, and I noticed other additions - arias and duets - along the way. I think this is one to purchase...

Good to see that Rossini is Composer of the Week and that it features some lesser known operas, starting with Il Signor Bruschino in a newly rereleased DG recording with a star-studded cast.