I like mine. 3str and 1% haste is pretty solid for a DD build. It's definitely limited to a DD option because you're better off tanking with a higher def shield with defensive boots like Iron Ram's 3str/vit/atk/eva.
As far as comparing DD shields, it depends on how much haste you have. With spell and swift, that would put you at 20%, which would start giving larger returns on haste (1.5-2%ish, although 50%+ haste 1% gives about 5% increase in damage). The only alternative that comes to mind is Viking at 12 attack, so the question is whether or not a 75% chance up fstr and 1% haste can outweigh 10.5 attack, which on generally you'll be hitting a couple points higher with Viking (1-3%ish increase in damage), so increase will be very close between the two if sentinel ups fstr.
Blitz ring is fail because it's only 1% haste competing for a slot with a lot of strong options (however 55%+ haste 1% can win out, though many people using it have like 20%). So for rings you could be have 7acc or 5str or 5dex or 4atk/acc.
Sentinel shield is basically competing against Viking or Iron Ram, which is a lot easier to compute. If blitz ring had 3 str on it, it would be a hell of a lot more expensive and common (think Unicorn Boots).
80 Pup Brd, 75 War Rdm Drg Sam Mnk Pld Bst Thf Whm Nin Smn Blm Rng, 72 Drk, 63 Cor, 50 Blu, 40 Dnc Sch