Is Netweaver the right choice?

We have recently upgrading our portal/webdynpro server to NW 7.0 Support Stack 14 (J2EE only).  While this stack level fixed some issues that we were having (in particular cleanup of JCO pools to prevent expired SSO ticket errors) it also introduced some other problems with Oracle.  This has led us to the discussion of whether Netweaver is the right choice for our custom application development environment. I'm posting this to get some feedback on what other companies are doing with their Netweaver enviroments.  I'm particularly interested in custom application development using webdynpro and the Netweaver Portal.
We've been running various permutations of the Netweaver platform since 2005 (BI, Portals, and now ERP).  We are using a single J2EE instance to host the SAP EP, a custom jsp "intranet", and our webdynpro apps (we have 6 custom webdynpro apps).  Our user base is somewhere between 150-250 users.  We use the portal to access these custom apps, our BW web templates, and some SAP transactions.  With the rolllout of some of these custom apps, our portals environment is now becoming mission critical and we seem to continue to have problems with the stability of the J2EE engine on the portal machine.
Are other customers having stability problems with NW04s?  Are other customers using web dynpro and SAP's enterprise portal for Mission Critical applications?  If so, what do your environments look like?  If not, what are you using for custom applications that communicate with SAP and other systems?
Thanks for any and all input
Eric

Assuming your legacy apps don't need to update the new OM system an MDB sounds reasonable. You may want to consider passing the messages as XML and using a library (JAXB/P, castor etc) for parsing / inserting into a database.
You should also work out how to handle technical failures updating the legacy database and poison messages (i.e. when an invalid message is received). You may decided to automatically retry technical failures a set number of times before moving them to a backout queue. There's no point retrying poison messages as they'll repeatedly fail, but you may need to fix / manually insert them.

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