YMMV, but I haven't had any problems with ext3 (other than speed issues)
This is going-off topic, but speed issues? Are you sure you're using directory indexing? (This feature keeps the filesystem structure in a hashed binary tree rather than series of linked-lists, which improves access time considerably on most Ext2/Ext3 filesystems)
Try running `tune2fs -O dir_index /dev/<partition>` on your Ext2/Ext3 partition(s) to enable this. You'll need to unmount the partition before doing this (booting from a LiveCD if needed). To re-optimize a Ext2/Ext3 filesystem's directory structure, you'll then need to run `e2fsck -D /dev/<partition>` (as previously mentioned, this should be done while the filesystem is not mounted). That prcoes may take a long time depending on the partition size...
If you're further interested, I've posted a thread[1] in Gentoo's DT&T forum that has more information.
[1] http://forums.gentoo.org/viewtopic-t-305871.html
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