Hi Charlie. Oh, it's easily worth it for Morrissey's voice-he is brilliant throughout.
Pat Metheny is a difficult one; I really fo feel it's his tone which kind of blands everything out but, with the exception of a few inc Grant Green, Django,Bill Frisell and Ralph Towner (a very sensitive player) I'm not really a fan of guitar taking a lead role in jazz. A bit like you, I've got a few Metheny records but most sort of pass me by: the best I have is 'Bright Size Life' but that may be largely due to the presence of Jaco Pastorius. 'Watercolour Days' with Eberhard Weber on bass is also good. I guess I like sonorous bass players!
Keith Jarrett. Well. I mean, that's huge because it's a huge catalogue. I'll make a few recommendations though which you could then investigate further, ie use Google!
Solo piano-The Bremen Lausanne Concerts (ECM) are sublime, beautiful, exciting, spiritual, rollicking and very much like Koln. I think they may be even better and I certainly prefer them. You know what to expect if you have The Koln Concert.: long lyrical passages and some bluesy, r and b vamps. 3 lp box set may be difficult to track down; I've got one and the cd version: the cd's sound fine. Also. 'Facing You.' his 1971 ECM debut is lovely. 'Staircase' (ECM) double lp is introspective and lyrical. 'The Paris Concert' is a good live solo piano record.
American Quartet: The Survivor's' Suite(ECM) This features Dewey Redman, Charlie Haden and Paul Motian and is beautifully played. Redman is an inventive, soulful and mercurial tenor player and Haden's bass is, well, similar. Also, 'Death And The Flower' and 'Byablue' are excellent. The conversations between Jarrett and Haden are often emotionally overwhelming on these records. Beautiful stuff. Then there's this; the most beautiful sax solo in the history of recorded jazz:
http://www.youtube.com/watch?v=BVk-h5cdy8o
The European Quartet: 'My Song' (ECM) with Jan Garbarek. Lovely tunes and top-class musicianship of course. 'Belonging' is also excellent. 'Personal Mountains' is a great live performance.
Highly regarded are also the reords he made with his Standards trio, playing ahem jazz standards. Can't comment, I haven't got any.
There's a load more: classical and symphonic stuff but I couldn't keep up with it. I think this earlier stuff is his most vital.
Hope this helps.