For our '4th choice' striker role he's ok, but it seems like we just add a throwaway option each summer, because it's hard to keep a good striker in this role for more than a season. It might be someone who only plays 15-20 games (inc. as sub), so at least with Eto'o (Osvaldo also had potential to do this) he could put together a small run of games where he makes an impact.
The salary is simply because it is one season and with no fee, similar to the Evra deal, which suggests the budget is being used elsewhere.
As a player he's obviously finished at his very top level, but he's different to what we have.