I'm trying to take a positive view.
He averages a goal every other game for almost every club he played for, except Ipswich during his early days and Tottenham.
Even for the failed stint at White Hart Lane, he was top league scorer in the league and for the club in season 08/09 with 12 and 17 goals respectively.
The names of Barrios and Lewandowski doesn't fill me with confidence - not saying they won't do well but compared to the stature of say Suarez was with Ajax, the duo are part of a raising Dortmund team, not exactly in the established star mould, at least not at the moment in my opinion.
I'm starting to be detached from figures and fees quoted/mentioned. The market has seldom been sane, clubs take advantage of buying club's need/desperation to strengthen a certain person, and most importantly, whats 10m-15m above valuation when we've blown 55m on 2 players? Not to say I condone such waste/non-nonsensical spending but one would like to think the likes of Ian Ayre knows where the club's financial standing is.
I'm not an advocator for EPL-proven either but how any signing now should be geared towards making an immediate impact for a surge towards CL qualification. Otherwise we might as well use the remaining of the season to 'bed' the signings in with a string of regular starts. Can't ignore the fact that having experience in the league does help - e.g. Enrique vs. Taiwo/Cissokho/Pereira etc. - surely the Championship experience helped.
There's the Euros too. Those established at their current club are unlikely to leave. Like Podolski mentioned, there's no need to jeopardize by moving to a new team/league. Besides they would've come so far probably because of their current club - so there's the sentimental part. Or for example in Valencia - Soldado's case, neither party have a strong case to sell/leave and at the moment are well-matched for each other.
Then there's also our current situation. Any signing coming in knows we're in the fight for CL qualification, with no guarantees that we'll make it. It could be a CL-less season next campaign. Might sound silly but its similar predicament that players joining clubs fighting against relegation face. Continue to excel and I might get a move to a big club next summer. Is the move worth the 'risks' involved?
Just want to reiterate I'm not advocating for Bent's signing, nor am I overly impressed with the rumour and link, less so by the price tag, but there are factors to consider