He is a good player, and I think as a sole striker he could do well for us. There's two factors we need to think of when thinking of Falcao.
1. His best performances, and his most productive output comes when he is a sole striker with genuine width. For the first 2/3rds of the season, we played extremely narrow and with 2 up top. This won't get the best out of him.
2. He is/was coming back from an ACL injury, playing in, physically, the most demanding league. The PL isn't a walk in the park, and it's been a graveyard for some top European strikers (Shevchenko, Crespo, Soldado). Or maybe it's just a graveyard for strikers whose names end with an o.
Now, if, (and it's a big if), we were to play to Falcao's strength, I do think he'd be able to put up similar figures he put up for Porto, and Atleti.
Should we? I don't think so - and I don't think he'd want to stay in this league following this season either.