We had dinner at both Cafe Mickey and Inventions.
We had such a bad experience in cafe Mickey, that we vowed never to go back there again. Long time waiting to be served (2 hours to get our main course finished, and even then we we had to leave before desert because I had promised DS a swim in the pool before it closed), poor character interaction (characters kept missing out our table) and the food was very average. We complained at the time to the manager, and also when we got back home - to be fair, Disney sent our son a lovely Stitch soft toy as compensation, but I wouldn't go back again. However, we might just have had an off day, so don't let that put you off.
Inventions on the other hand we loved - so much so, that we will probably go back there twice during our stay this year! The character interactions were great (the Genie and Tigger were mucking about lots, plus we also saw Mickey, Minnie, Goofy, Chip, Dale and Pluto) and we just loved the buffet food - the seafood was especially good. If you like buffets (and we do) then it is the best one we have been to - but I know not everybody likes buffets.
We also found the character interaction at Auberge the best of our trip, so consider that too - although it is a bit on the pricey side without the meal plan vouchers.