Probably not... and here's why:
TF2 Min Spec:
1.7 GHz Processor
DirectX® 8.1 level Graphics Card
PowerPC-base Core @3.2GHz
256MB RAM @3.2GHz
256MB GFX RAM @700MHz
Now, the problem is we don't do know if the RSX is DX8.1 capiable or not. I also can't find out if WINE can force the card to run in DX8.1... so that's an issue. The other issue, of course, is the fact that the PS3 has half of the RAM required to run TF2 as a minimum.
So yeah, I don't think it'll work. You've got GameOS loaded, then you'll have to load Linux... then you've gotta load steam and finally TF2, all into a paltry 256MB RAM.
60GB (120GB WD Scorpio Drive) PS3 (CECHA01, NTSC), 3.7OFW
60GB (640GB Samsung Drive) PS3 (CECHC04, PAL), Kmeaw 3.55, Repaired (Dead Laser)
PSP-1003 FAT, CFW5.00 M33-6 & Prometheus v2
X-Box 360 Xenon (JTAG'ed, 500GB HDD)