Serious Sam: 3BFE is by the far the worst game in the franchise. The GBA game is better than that. Not from the lack of trying mind you. The GBA game is pretty decent.
Sonic Forces I popped back in, I still consider it a good game, despite the large production trouble. Some levels could have lasted longer, but they are still fun levels, even if most of them are pretty basic or standard fair. I will say the Classic Sonic levels are still the weakest though. Especially that fucking auto scroller being Classic Sonic's last solo level. WTF was SEGA thinking there?